title stringlengths 10 172 | question_id int64 469 40.1M | question_body stringlengths 22 48.2k | question_score int64 -44 5.52k | question_date stringlengths 20 20 | answer_id int64 497 40.1M | answer_body stringlengths 18 33.9k | answer_score int64 -38 8.38k | answer_date stringlengths 20 20 | tags list |
|---|---|---|---|---|---|---|---|---|---|
Issue with pattern program using loops | 39,931,798 | <p>I'm writing a program that takes two inputs, number of lines and number of cheers as input. The number of lines is how many lines the user wants to print out and the number of cheers are in the format that 1 cheer is the word "GO" and two cheers are two "GO" s ...and their is the word "BUDDY" within two neighboring ... | 0 | 2016-10-08T11:27:11Z | 39,931,979 | <p>Often in Python you don't need any loops</p>
<pre><code>lines = int(input('Lines= '))
cheers = int(input('Cheers= '))
line = ' BUDDY '.join(['GO']*cheers)
for i in range(cheers):
print(' '*(i*3) + line)
</code></pre>
| 1 | 2016-10-08T11:48:58Z | [
"python",
"python-2.7",
"design-patterns"
] |
Issue with pattern program using loops | 39,931,798 | <p>I'm writing a program that takes two inputs, number of lines and number of cheers as input. The number of lines is how many lines the user wants to print out and the number of cheers are in the format that 1 cheer is the word "GO" and two cheers are two "GO" s ...and their is the word "BUDDY" within two neighboring ... | 0 | 2016-10-08T11:27:11Z | 39,932,051 | <p>Try this.</p>
<pre><code>def greet(lines, cheers):
for i in range (lines):
output = (" ") * i + "Go"
for j in range (cheers):
if cheers == 1:
print output
break
output += "Budddy Go"
print output
</code></pre>
<p>Hope this helps.<... | 1 | 2016-10-08T11:57:14Z | [
"python",
"python-2.7",
"design-patterns"
] |
JSON sub for loop produces KeyError, but key exists | 39,931,910 | <p>I'm trying to add the JSON output below into a dictionary, to be saved into a SQL database.</p>
<pre><code>{'Parkirisca': [
{
'ID_Parkirisca': 2,
'zasedenost': {
'Cas': '2016-10-08 13:17:00',
'Cas_timestamp': 1475925420,
'ID_ParkiriscaNC': 9,
... | 0 | 2016-10-08T11:40:30Z | 39,932,458 | <p>I fixed up your code:</p>
<ol>
<li>Added required imports.</li>
<li>Fixed the <code>pprint savetodb</code> line which isn't valid Python.</li>
<li>Didn't try to iterate over <code>carpark['zasedenost']</code>.</li>
</ol>
<p>I then added another <code>pprint</code> statement in the <code>for</code> loop to see what... | 1 | 2016-10-08T12:39:40Z | [
"python",
"json",
"list",
"for-loop",
"dictionary"
] |
How do I convert a list to an integer? | 39,931,912 | <p>This my code:</p>
<pre><code>snumA = random.sample([4,8,3], 1)
snumB = random.sample([7,2,6], 1)
snumC = random.sample([1,5,9], 1)
sgnA = random.choice(['+','-','/','*'])
sgnB = random.choice(['+','-','/','*'])
sgnC = random.choice(['+','-','/','*'])
if sgnA == '-' :
sum1 = snumA - bnumA
print 'minus'
if ... | 0 | 2016-10-08T11:40:36Z | 39,931,942 | <p>Change to :</p>
<pre><code>snumA = random.choice([4,8,3])
</code></pre>
<p>which will give you an <code>int</code> instead of a <code>list</code>. To understand better the error here is that you try to use lists (cause <code>random.sample</code> returns a list type result) as integers to make arithmetic operations... | 4 | 2016-10-08T11:44:13Z | [
"python"
] |
How do I convert a list to an integer? | 39,931,912 | <p>This my code:</p>
<pre><code>snumA = random.sample([4,8,3], 1)
snumB = random.sample([7,2,6], 1)
snumC = random.sample([1,5,9], 1)
sgnA = random.choice(['+','-','/','*'])
sgnB = random.choice(['+','-','/','*'])
sgnC = random.choice(['+','-','/','*'])
if sgnA == '-' :
sum1 = snumA - bnumA
print 'minus'
if ... | 0 | 2016-10-08T11:40:36Z | 39,932,129 | <p>The problem is: <code>snumA = random.sample([4,8,3], 1)</code> returns a list of one element (for example: [3] ). What you can do instead is:
Either use <code>snumA = random.choice([4,8,3])</code> which returns directly an integer. Or you get hold of the first element of your list with <code>snumA[0]</code> or direc... | 2 | 2016-10-08T12:05:17Z | [
"python"
] |
How do I convert a list to an integer? | 39,931,912 | <p>This my code:</p>
<pre><code>snumA = random.sample([4,8,3], 1)
snumB = random.sample([7,2,6], 1)
snumC = random.sample([1,5,9], 1)
sgnA = random.choice(['+','-','/','*'])
sgnB = random.choice(['+','-','/','*'])
sgnC = random.choice(['+','-','/','*'])
if sgnA == '-' :
sum1 = snumA - bnumA
print 'minus'
if ... | 0 | 2016-10-08T11:40:36Z | 39,932,182 | <ol>
<li>As suggested before, use random.choice</li>
<li>bnumA is not defined. The code below assumes you meant snumB</li>
</ol>
<p>So the code you are looking for might be:</p>
<pre><code>import random
snumA = random.choice([4,8,3])
snumB = random.choice([7,2,6])
snumC = random.choice([1,5,9])
operators = {'+':'Pl... | 1 | 2016-10-08T12:10:34Z | [
"python"
] |
Old (sklearn 0.17) GMM, DPGM, VBGMM vs new (sklearn 0.18) GaussianMixture and BayesianGaussianMixture | 39,931,922 | <p>In previous scikit-learn version (0.1.17) I used the following code to automatically determine best Gaussian mixture models and optimize hyperparameters (alpha, covariance type, bic) for unsupervised clustering.</p>
<pre><code># Gaussian Mixture Model
try:
# Determine the most suitable covariance_type
... | 0 | 2016-10-08T11:41:11Z | 39,935,265 | <p>The BIC score is still available for the classical / EM implementation of GMMs as implemented in the GaussianMixture class.</p>
<p>The BayesianGaussianMixture class can automatically tune the number of effective components (n_components should just be big enough) for a given value of <code>alpha</code>.</p>
<p>You... | 0 | 2016-10-08T17:27:08Z | [
"python",
"scikit-learn",
"cluster-analysis",
"gaussian",
"unsupervised-learning"
] |
Create a DTM from large corpus | 39,931,941 | <p>I have a set of texts contained in a list, which I loaded from a csv file</p>
<p><code>texts=['this is text1', 'this would be text2', 'here we have text3']</code></p>
<p>and I would like to create a document-term matrix, by using <em>stemmed words</em>.
I have also stemmed them to have:</p>
<p><code>[['text1'], [... | 1 | 2016-10-08T11:44:08Z | 39,933,594 | <p>Why don't you use <code>sklearn</code>? The <code>CountVectorizer()</code> method <strong>converts a collection of text documents to a matrix of token counts</strong>. What's more it gives a sparse representation of the counts using <code>scipy</code>.</p>
<p>You can either give your raw entries to the method or pr... | 1 | 2016-10-08T14:31:50Z | [
"python",
"pandas",
"scikit-learn",
"nltk"
] |
How to build python code for mac os x using cx_freeze on windows? | 39,932,044 | <p>I have installed cx_freeze and it works like a charm to build .exe but I want to make executable file of my python program for mac os x using windows 7. Can you guide me how I can do it using cx_freeze or any other application.</p>
<p>I use following code to build .exe</p>
<pre><code>from cx_Freeze import setup, E... | 0 | 2016-10-08T11:56:20Z | 39,932,119 | <p>There is no simple way. You need to compile your app on OS X to include the OS X specific libraries (the shared libraries and other dependencies). </p>
<p>You need to do this on OS X. </p>
| 0 | 2016-10-08T12:04:33Z | [
"python",
"windows",
"osx",
"cx-freeze"
] |
How to build python code for mac os x using cx_freeze on windows? | 39,932,044 | <p>I have installed cx_freeze and it works like a charm to build .exe but I want to make executable file of my python program for mac os x using windows 7. Can you guide me how I can do it using cx_freeze or any other application.</p>
<p>I use following code to build .exe</p>
<pre><code>from cx_Freeze import setup, E... | 0 | 2016-10-08T11:56:20Z | 39,932,192 | <p>Install VirtalBox.</p>
<p>Then follow this guide to install an OS X virtual machine: <a href="http://lifehacker.com/5938332/how-to-run-mac-os-x-on-any-windows-pc-using-virtualbox" rel="nofollow">http://lifehacker.com/5938332/how-to-run-mac-os-x-on-any-windows-pc-using-virtualbox</a></p>
<p>Then you will be able to... | 0 | 2016-10-08T12:11:20Z | [
"python",
"windows",
"osx",
"cx-freeze"
] |
Mongodb aggregate out of memory | 39,932,096 | <p>I'm using mongodb aggregate to sample documents from a large collection.</p>
<p><a href="https://docs.mongodb.com/manual/reference/operator/aggregation/sample/" rel="nofollow">https://docs.mongodb.com/manual/reference/operator/aggregation/sample/</a></p>
<p>After making several consecutive calls, I see the memory ... | 1 | 2016-10-08T12:02:29Z | 39,934,310 | <p>The reason you are asking this is because you don't know how the <a href="https://docs.mongodb.com/manual/reference/operator/aggregation/sample/" rel="nofollow"><code>$sample</code></a> operator works. As mentioned in the <a href="https://docs.mongodb.com/manual/reference/operator/aggregation/sample/#behavior" rel="... | 1 | 2016-10-08T15:46:23Z | [
"python",
"mongodb",
"pymongo",
"aggregation-framework"
] |
Mongodb aggregate out of memory | 39,932,096 | <p>I'm using mongodb aggregate to sample documents from a large collection.</p>
<p><a href="https://docs.mongodb.com/manual/reference/operator/aggregation/sample/" rel="nofollow">https://docs.mongodb.com/manual/reference/operator/aggregation/sample/</a></p>
<p>After making several consecutive calls, I see the memory ... | 1 | 2016-10-08T12:02:29Z | 39,934,839 | <p>It turns out the issue was the storage engine cache. I'm using an EC2 instance, and it resulted in OOM error there. I've been able to solve it by assigning a smaller cache size like this:</p>
<pre><code>mongod --dbpath /a/path/to/db --logpath /a/path/to/log --storageEngine wiredTiger --wiredTigerEngineConfigString=... | 0 | 2016-10-08T16:43:33Z | [
"python",
"mongodb",
"pymongo",
"aggregation-framework"
] |
Global variables code confusion | 39,932,120 | <p>I am having trouble getting data input from one class to another and I cant seem to get the global function to work. The part i need help with is in the last function but it only works if you have the whole code.</p>
<pre><code>import tkinter as tk
import os
self = tk
TITLE_FONT = ("AmericanTypewriter", 18, "bold"... | -3 | 2016-10-08T12:04:40Z | 39,932,375 | <p>If you want to use global variables, you need to do this:</p>
<pre><code>var1 = <some value>
var2 = <some other value>
s1 = <yet another value here>
# then create your classes
class Whatever(tk.whatever_you_want):
def __init__(self, arg1, arg2, whatever_arg):
global var1 #whis tells... | 0 | 2016-10-08T12:31:12Z | [
"python",
"python-3.x",
"global-variables"
] |
Django Custom Admin Form bulk save implmentation | 39,932,134 | <p>I am trying to implement a CSV Import in Django Admin and save bulk data corresponding to the CSV file's rows.</p>
<p>This is my Admin class:</p>
<pre><code>class EmployeeAdmin(admin.ModelAdmin):
list_display = ('user', 'company', 'department', 'designation', 'is_hod', 'is_director')
search_fields = ['user... | 0 | 2016-10-08T12:05:38Z | 39,932,272 | <p>You should just add the <code>super().save()</code> to the the end of the function:</p>
<pre><code>def save(self, *args, commit=True, **kwargs):
try:
company = self.cleaned_data['company']
records = csv.reader(self.cleaned_data['file_to_import'])
for line in records:
# Get CS... | 1 | 2016-10-08T12:19:23Z | [
"python",
"django",
"csv"
] |
Make the background of an image transparant in Pygame with convert_alpha | 39,932,138 | <p>I am trying to make the background of an image transparant in a Pygame script. Now the background in my game is black, instead of transparant. I read somewhere else that I could use <code>convert_alpha</code>, but it doesn't seem to work.</p>
<p>Here is (the relevant part of) my code:</p>
<pre><code>import PIL
gam... | 0 | 2016-10-08T12:06:16Z | 39,938,626 | <p>To make an image transparent you first need an image with alpha values. Be sure that it meets this criteria! I noticed that my images doesn't save the alpha values when saving as bmp. Apparently, <a href="http://www.ehow.com/how_12224322_make-bmp-transparent.html" rel="nofollow">the bmp format do not have native tra... | 1 | 2016-10-09T00:00:41Z | [
"python",
"pygame"
] |
How modules know each other | 39,932,230 | <p>I can plot data from a CSV file with the following code:</p>
<pre><code>import pandas as pd
import matplotlib.pyplot as plt
df = pd.read_csv('test0.csv',delimiter='; ', engine='python')
df.plot(x='Column1', y='Column3')
plt.show()
</code></pre>
<p>But I don't understand one thing. How <code>plt.show()</code> knows... | 2 | 2016-10-08T12:15:48Z | 39,932,312 | <p>According to <a href="http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.show" rel="nofollow">http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.show</a> , the <code>plt.show()</code> itself doesn't know about the data, you need to pass the data as parameters.</p>
<p>What you are seeing should be ... | 1 | 2016-10-08T12:23:17Z | [
"python",
"python-2.7"
] |
How modules know each other | 39,932,230 | <p>I can plot data from a CSV file with the following code:</p>
<pre><code>import pandas as pd
import matplotlib.pyplot as plt
df = pd.read_csv('test0.csv',delimiter='; ', engine='python')
df.plot(x='Column1', y='Column3')
plt.show()
</code></pre>
<p>But I don't understand one thing. How <code>plt.show()</code> knows... | 2 | 2016-10-08T12:15:48Z | 39,932,362 | <p>From the pandas docs on <a href="https://github.com/pydata/pandas/blob/cebc70cc277462176edea73bb71eaad9f83e9f47/doc/source/visualization.rst#basic-plotting-plot" rel="nofollow">plotting</a>:</p>
<blockquote>
<p>The <code>plot</code> method on Series and DataFrame is just a simple wrapper
around :meth:<code>plt.... | 2 | 2016-10-08T12:29:36Z | [
"python",
"python-2.7"
] |
How modules know each other | 39,932,230 | <p>I can plot data from a CSV file with the following code:</p>
<pre><code>import pandas as pd
import matplotlib.pyplot as plt
df = pd.read_csv('test0.csv',delimiter='; ', engine='python')
df.plot(x='Column1', y='Column3')
plt.show()
</code></pre>
<p>But I don't understand one thing. How <code>plt.show()</code> knows... | 2 | 2016-10-08T12:15:48Z | 39,932,541 | <p>Matplotlib has two "interfaces": a <a href="http://jakevdp.github.io/mpl_tutorial/tutorial_pages/tut1.html" rel="nofollow">Matlab-style interface</a> and an <a href="http://jakevdp.github.io/mpl_tutorial/tutorial_pages/tut2.html" rel="nofollow">object-oriented interface</a>. </p>
<p>Plotting with the Matlab-style i... | 3 | 2016-10-08T12:47:15Z | [
"python",
"python-2.7"
] |
Merge two arrays into an list of arrays | 39,932,444 | <p>Hi I am trying compile a bunch of arrays that I have in a dictionary using a for loop and I cant seem to find proper solution for this.</p>
<p>Essentially what I have in a simplified form:</p>
<pre><code>dict['w1']=[1,2,3]
dict['w2']=[4,5,6]
dict['w3']=[7,8]
x = []
for i in range(3):
x = np.concatenate([x],[d... | 2 | 2016-10-08T12:38:15Z | 39,932,508 | <p>Just <code>append</code> the item to the list. Note, BTW, that <code>range</code> starts with <code>0</code> if you don't specify the start value and treats the end value as an <strong>exclusive</strong> border:</p>
<pre><code>x = []
for i in range(1, 4):
x.append(dict['w' + str(i)])
</code></pre>
| 0 | 2016-10-08T12:43:44Z | [
"python",
"arrays",
"python-3.x",
"numpy",
"jupyter"
] |
Merge two arrays into an list of arrays | 39,932,444 | <p>Hi I am trying compile a bunch of arrays that I have in a dictionary using a for loop and I cant seem to find proper solution for this.</p>
<p>Essentially what I have in a simplified form:</p>
<pre><code>dict['w1']=[1,2,3]
dict['w2']=[4,5,6]
dict['w3']=[7,8]
x = []
for i in range(3):
x = np.concatenate([x],[d... | 2 | 2016-10-08T12:38:15Z | 39,932,509 | <p>One approach would be to get the argsort indices based on the keys and sort the elements/values out of the dictionary using those indices, like so -</p>
<pre><code>np.take(dict.values(),np.argsort(dict.keys()))
</code></pre>
<p>If you need a list as the output, add <a href="http://docs.scipy.org/doc/numpy/referenc... | 1 | 2016-10-08T12:43:46Z | [
"python",
"arrays",
"python-3.x",
"numpy",
"jupyter"
] |
Merge two arrays into an list of arrays | 39,932,444 | <p>Hi I am trying compile a bunch of arrays that I have in a dictionary using a for loop and I cant seem to find proper solution for this.</p>
<p>Essentially what I have in a simplified form:</p>
<pre><code>dict['w1']=[1,2,3]
dict['w2']=[4,5,6]
dict['w3']=[7,8]
x = []
for i in range(3):
x = np.concatenate([x],[d... | 2 | 2016-10-08T12:38:15Z | 39,932,524 | <p>Comprehension:</p>
<pre><code># using name as "dict" is not proper use "_dict" otherwise.
dict['w1']=[1,2,3]
dict['w2']=[4,5,6]
dict['w3']=[7,8]
x = [dict["w"+str(i)] for i in range(1, 4)]
</code></pre>
<p>gives output:</p>
<pre><code>[[1, 2, 3], [4, 5, 6], [7, 8]]
</code></pre>
| 2 | 2016-10-08T12:45:37Z | [
"python",
"arrays",
"python-3.x",
"numpy",
"jupyter"
] |
Merge two arrays into an list of arrays | 39,932,444 | <p>Hi I am trying compile a bunch of arrays that I have in a dictionary using a for loop and I cant seem to find proper solution for this.</p>
<p>Essentially what I have in a simplified form:</p>
<pre><code>dict['w1']=[1,2,3]
dict['w2']=[4,5,6]
dict['w3']=[7,8]
x = []
for i in range(3):
x = np.concatenate([x],[d... | 2 | 2016-10-08T12:38:15Z | 39,932,565 | <p>If you mean lists and not dictionarys, then you're looking for the zip command.</p>
<p>Zip (w1,w2,w3)</p>
| 0 | 2016-10-08T12:50:04Z | [
"python",
"arrays",
"python-3.x",
"numpy",
"jupyter"
] |
How do I write a program out of provided unittest | 39,932,472 | <p>I have a unittests for a program. Being new to test driven development, how can I generate a program from the given tests</p>
<p>For example I have this test:</p>
<pre><code>class MaxMinTest(TestCase):
"""docstring for MaxMinTest"""
def test_find_max_min_four(self):
self.assertListEqual([1, 4],
... | 0 | 2016-10-08T12:41:02Z | 39,932,582 | <p>Without giving you the answer to the code that would make these tests pass, your approach can be something like this:</p>
<ul>
<li><p>What are you testing? </p></li>
<li><p>What does this function take, and what does it return?</p></li>
<li><p>How do I make <strong>one</strong> test pass? Once I make one test pass,... | 1 | 2016-10-08T12:51:24Z | [
"python",
"python-2.7",
"unit-testing",
"tdd"
] |
Comparing two columns in different file and printing match if difference between record in a columns less than or equal to 0.001 | 39,932,484 | <p>I have two text files, say file1.txt contains something like </p>
<pre><code>100.145 10.0728
100.298 10.04
100.212 10.0286
</code></pre>
<p>and file2.txt contains something like </p>
<pre><code>100.223 8.92739
100.209 9.04269
100.084 9.08411
</code></pre>
<p>I want to compare column 1 and column 2 of both files ... | 0 | 2016-10-08T12:41:59Z | 39,932,607 | <p>Just read both files, split by line break, split those lines by spaces and then loop over the first files lines and for each line check whether the second files line at this position matches your condition.</p>
<pre class="lang-py prettyprint-override"><code>with open("file1.txt", "r") as f:
f1_content = f.read()... | 1 | 2016-10-08T12:54:18Z | [
"python",
"awk"
] |
Comparing two columns in different file and printing match if difference between record in a columns less than or equal to 0.001 | 39,932,484 | <p>I have two text files, say file1.txt contains something like </p>
<pre><code>100.145 10.0728
100.298 10.04
100.212 10.0286
</code></pre>
<p>and file2.txt contains something like </p>
<pre><code>100.223 8.92739
100.209 9.04269
100.084 9.08411
</code></pre>
<p>I want to compare column 1 and column 2 of both files ... | 0 | 2016-10-08T12:41:59Z | 39,932,947 | <p>I would use <code>paste</code> to combine the files and then let <code>awk</code> do the rest:</p>
<pre><code>paste file1.txt file2.txt |
awk '
function abs(v) {return v < 0 ? -v : v}
abs($1-$3) <= lim && abs($2-$4) <= lim
' lim=0.001
</code></pre>
<p><code>abs</code> function definition copie... | 0 | 2016-10-08T13:28:43Z | [
"python",
"awk"
] |
relation between tuple values in a list according to their position | 39,932,488 | <p>Consider a list containing tuples like:</p>
<pre><code>tuplelist = [('a','b', 'c', 'd'), (6, 3, 9, 11), (0, 4, 5, 6)]
</code></pre>
<p>How can i match corresponding tuple positions.For ex for <code>'d'</code>:</p>
<pre><code>(d, 'has_val', 11)
(d, 'has_val', 6)
</code></pre>
<p>i have tried the following:</p>
<... | 2 | 2016-10-08T12:42:13Z | 39,932,532 | <p>Sounds like <code>zip</code> is your friend:</p>
<pre><code>>>> zip(*tuplelist)
[('a', 6, 0), ('b', 3, 4), ('c', 9, 5), ('d', 11, 6)]
</code></pre>
<p>You can use <code>zip</code> a little bit like a matrix transpose in math. Anyway, for your situation, we can do:</p>
<pre><code>for x in zip(*tuplelist)... | 3 | 2016-10-08T12:46:26Z | [
"python",
"list",
"python-3.x",
"tuples"
] |
relation between tuple values in a list according to their position | 39,932,488 | <p>Consider a list containing tuples like:</p>
<pre><code>tuplelist = [('a','b', 'c', 'd'), (6, 3, 9, 11), (0, 4, 5, 6)]
</code></pre>
<p>How can i match corresponding tuple positions.For ex for <code>'d'</code>:</p>
<pre><code>(d, 'has_val', 11)
(d, 'has_val', 6)
</code></pre>
<p>i have tried the following:</p>
<... | 2 | 2016-10-08T12:42:13Z | 39,932,592 | <p>Just simpley use tuple and list indices. If you only want one value from one specfic place in a container, don't use a loop, just use indices.</p>
<pre><code>res = (tuplelist[0][3],'has_val', tuplelist[1][3])
</code></pre>
<p>Full program:</p>
<pre><code>tuplelist = [('a', 'b', 'c', 'd'), (6, 3, 9, 11), (0, 4, 5,... | 1 | 2016-10-08T12:52:54Z | [
"python",
"list",
"python-3.x",
"tuples"
] |
relation between tuple values in a list according to their position | 39,932,488 | <p>Consider a list containing tuples like:</p>
<pre><code>tuplelist = [('a','b', 'c', 'd'), (6, 3, 9, 11), (0, 4, 5, 6)]
</code></pre>
<p>How can i match corresponding tuple positions.For ex for <code>'d'</code>:</p>
<pre><code>(d, 'has_val', 11)
(d, 'has_val', 6)
</code></pre>
<p>i have tried the following:</p>
<... | 2 | 2016-10-08T12:42:13Z | 39,932,645 | <p>Firstly, Don't name your variable as <code>str</code> as it shadows the builtin function. </p>
<pre><code>tuplelist = [('a','b', 'c', 'd'), (6, 3, 9, 11), (0, 4, 5, 6)]
s = 'has_val'
</code></pre>
<p>Now coming to your issue, It's aesthetic to have the first row out as a header row. Also note that, I've used the <... | 3 | 2016-10-08T12:58:21Z | [
"python",
"list",
"python-3.x",
"tuples"
] |
relation between tuple values in a list according to their position | 39,932,488 | <p>Consider a list containing tuples like:</p>
<pre><code>tuplelist = [('a','b', 'c', 'd'), (6, 3, 9, 11), (0, 4, 5, 6)]
</code></pre>
<p>How can i match corresponding tuple positions.For ex for <code>'d'</code>:</p>
<pre><code>(d, 'has_val', 11)
(d, 'has_val', 6)
</code></pre>
<p>i have tried the following:</p>
<... | 2 | 2016-10-08T12:42:13Z | 39,932,651 | <p>zip() can work for your problem</p>
<pre><code>tuplelist = [('a','b', 'c', 'd'), (6, 3, 9, 11), (0, 4, 5, 6)]
tuplelist_withposition=zip(tuplelist[0],tuplelist[1],tuplelist[2])
s = 'has_val'
for i in tuplelist_withposition:
rel = (i[0],s,i[1])
print rel
rel=(i[0],s,i[2])
print rel
</code></pre... | 2 | 2016-10-08T12:58:30Z | [
"python",
"list",
"python-3.x",
"tuples"
] |
Dynamically updating the PYTHONPATH prevents .pyc update | 39,932,498 | <p>To allow myself to have a clear filestructure in my project i am using the following code snippet to dynamically add the project main folder to the PYTHONPATH and therefore assure that I can import files even from above a files location.</p>
<pre class="lang-py prettyprint-override"><code>import sys
import os
sys.p... | 0 | 2016-10-08T12:43:06Z | 39,932,583 | <p>You could try to make python not write those *.pyc files.</p>
<p><a href="http://stackoverflow.com/questions/154443/how-to-avoid-pyc-files">How to avoid .pyc files?</a></p>
<p>For large projects this would matter slightly from a performance perspective. It's possible that you don't care about that, and then you ca... | 1 | 2016-10-08T12:51:50Z | [
"python",
"pythonpath",
"pyc"
] |
Dynamically updating the PYTHONPATH prevents .pyc update | 39,932,498 | <p>To allow myself to have a clear filestructure in my project i am using the following code snippet to dynamically add the project main folder to the PYTHONPATH and therefore assure that I can import files even from above a files location.</p>
<pre class="lang-py prettyprint-override"><code>import sys
import os
sys.p... | 0 | 2016-10-08T12:43:06Z | 39,932,711 | <p>Adding the path of an already imported module can get you into trouble if module names are no longer unique. Consider that you do <code>import foo</code>, which adds its parent package <code>bar</code> to <code>sys.path</code> - it's now possible to also do <code>import bar.foo</code>. Python will consider both to b... | 0 | 2016-10-08T13:05:49Z | [
"python",
"pythonpath",
"pyc"
] |
Calling a method within a Class | 39,932,679 | <p>I have the following class however when i try calling the method in an object, nothing happens</p>
<pre><code>class parentClass:
def test(self):
if 3 > 2:
print "This is true"
else:
print "This is false"
object1 = parentClass()
object1.test
</code></pre>
<p>Can someone please tel me wh... | -3 | 2016-10-08T13:02:37Z | 39,932,689 | <p>You forget "()":</p>
<pre><code> object1.test()
</code></pre>
<p>Remember the methods need to be called with the brackets, for example in the propierties are not need it.</p>
| 1 | 2016-10-08T13:03:50Z | [
"python",
"python-2.7",
"python-3.x"
] |
Calling a method within a Class | 39,932,679 | <p>I have the following class however when i try calling the method in an object, nothing happens</p>
<pre><code>class parentClass:
def test(self):
if 3 > 2:
print "This is true"
else:
print "This is false"
object1 = parentClass()
object1.test
</code></pre>
<p>Can someone please tel me wh... | -3 | 2016-10-08T13:02:37Z | 39,932,705 | <p>specifying a method with the parentheses just returns a reference to it. In order to call it, you need to have <code>()</code> (and optionally, any arguments) after it:</p>
<pre><code>object1.test()
</code></pre>
| 1 | 2016-10-08T13:05:11Z | [
"python",
"python-2.7",
"python-3.x"
] |
Calling a method within a Class | 39,932,679 | <p>I have the following class however when i try calling the method in an object, nothing happens</p>
<pre><code>class parentClass:
def test(self):
if 3 > 2:
print "This is true"
else:
print "This is false"
object1 = parentClass()
object1.test
</code></pre>
<p>Can someone please tel me wh... | -3 | 2016-10-08T13:02:37Z | 39,932,726 | <p>add parentheses '()' to the method name where you're calling it.</p>
<p>object1.test()</p>
| 1 | 2016-10-08T13:08:25Z | [
"python",
"python-2.7",
"python-3.x"
] |
Calling a method within a Class | 39,932,679 | <p>I have the following class however when i try calling the method in an object, nothing happens</p>
<pre><code>class parentClass:
def test(self):
if 3 > 2:
print "This is true"
else:
print "This is false"
object1 = parentClass()
object1.test
</code></pre>
<p>Can someone please tel me wh... | -3 | 2016-10-08T13:02:37Z | 39,932,755 | <p>To call a function it requires '()'. Without these it's just a reference not a call.</p>
<pre><code>object1.test ()
</code></pre>
<p>Hope this helps.</p>
| 1 | 2016-10-08T13:11:07Z | [
"python",
"python-2.7",
"python-3.x"
] |
pandas unique values multiple columns different dtypes | 39,932,685 | <p>Similar to <a href="http://stackoverflow.com/questions/26977076/pandas-unique-values-multiple-columns">pandas unique values multiple columns</a> I want to count the number of unique values per column. However, as the dtypes differ I get the following error:
<a href="http://i.stack.imgur.com/78Fd5.jpg" rel="nofollow"... | 0 | 2016-10-08T13:03:17Z | 39,933,598 | <p>Use <code>apply</code> and <code>np.unique</code> to grab the unique values in each column and take its <code>size</code>:</p>
<pre><code>small[['TARGET','title']].apply(lambda x: np.unique(x).size)
</code></pre>
<p>Thanks!</p>
| 1 | 2016-10-08T14:32:14Z | [
"python",
"pandas",
"unique"
] |
Right code but still test case is not running in python | 39,932,791 | <p>Given an array of ints, return True if .. 1, 2, 3, .. appears in the array somewhere.</p>
<pre><code>def array123(nums):
for i in nums:
if nums[i:i+3] == [1,2,3]:
return True
return False
</code></pre>
<p><a href="http://codingbat.com/prob/p193604" rel="nofollow">Coding bat problem</a></p... | -2 | 2016-10-08T13:14:36Z | 39,932,832 | <p>Your code is not completely right. You're slicing the list with the items in the list, not with indices. Luckily, this did not throw any error because the items in the list are within the bounds of the list's indices or rather <em>slicing</em> does not raise errors, when done correclty, irrespective of start and/or ... | 1 | 2016-10-08T13:17:21Z | [
"python",
"python-3.x"
] |
Right code but still test case is not running in python | 39,932,791 | <p>Given an array of ints, return True if .. 1, 2, 3, .. appears in the array somewhere.</p>
<pre><code>def array123(nums):
for i in nums:
if nums[i:i+3] == [1,2,3]:
return True
return False
</code></pre>
<p><a href="http://codingbat.com/prob/p193604" rel="nofollow">Coding bat problem</a></p... | -2 | 2016-10-08T13:14:36Z | 39,932,862 | <p>You're getting wrong result because you're iterating on the value of elements not on the index of elements of elements. Try following code</p>
<pre><code>def array123(nums):
for i in range(len(nums)-2):
if nums[i:i+3] == [1,2,3]:
return True
return False
</code></pre>
<p>And remember to gi... | 0 | 2016-10-08T13:20:56Z | [
"python",
"python-3.x"
] |
Right code but still test case is not running in python | 39,932,791 | <p>Given an array of ints, return True if .. 1, 2, 3, .. appears in the array somewhere.</p>
<pre><code>def array123(nums):
for i in nums:
if nums[i:i+3] == [1,2,3]:
return True
return False
</code></pre>
<p><a href="http://codingbat.com/prob/p193604" rel="nofollow">Coding bat problem</a></p... | -2 | 2016-10-08T13:14:36Z | 39,932,905 | <p>It should be like this.</p>
<pre><code>def array123(nums):
for i in range(len(nums)):
if nums[i:i+3] == [1,2,3]:
return True
return False
</code></pre>
<p>Try this. Hope this helps. :)</p>
| 1 | 2016-10-08T13:24:30Z | [
"python",
"python-3.x"
] |
Regular expression to extract data from news page | 39,932,825 | <p>Hi I'm running python regular expression to extract some data from news pages, however when it is displayed the code produces brackets and apostrophes in the output. For example this is my code:</p>
<pre><code>description_title = findall('<item>[\s]*<title[^>]*>(.*?)<\/title>[\s]*<descriptio... | 0 | 2016-10-08T13:16:56Z | 39,932,856 | <p>By using <a href="https://docs.python.org/2/library/functions.html#str" rel="nofollow"><code>str</code></a>, you're printing a Python string representation of <code>description_title</code> (which is a <code>list</code> of length 1). Try without the <code>str</code>:</p>
<pre><code>'<h3 align="Center">' + de... | 1 | 2016-10-08T13:20:20Z | [
"python",
"html",
"regex"
] |
Python redis rpop is resultng b'value' list structure | 39,932,873 | <p>I am working on a simple redis and flask project using docker compose. my flask manuplates redis list structure using lpush, rpop. It worked fine until i was playing with commands like brpop which now made all my results b'value'. I tried to work with the first commands only, but somehow the b'value' output keeps co... | 0 | 2016-10-08T13:22:37Z | 39,943,518 | <p>It seems that redis strings are Python bytes strings (see the documentation about <a href="http://redis.io/topics/data-types" rel="nofollow">Data Types</a>).</p>
<p>So, I think there is a automatic conversion from Unicode to Bytes in Python 3 (and maybe in Python 2 too).</p>
<p>To work with Unicode string, you can... | 0 | 2016-10-09T12:17:07Z | [
"python",
"list",
"redis",
"docker-compose"
] |
Aide in modifying this code removing the ' * ' operator and using while loops instead? | 39,932,875 | <p>How can I modify my code and remove the ' * ' operator which I have used to multiply strings and use while loops instead of it to produce the same pattern?</p>
<pre><code>i = 1
x = 1
while i <= 4:
print "v"*x
print "v"*x
x = x+1
i+=1
print "v"*5
b = 4
while b>=1:
print "v"*b
print "v"*... | -3 | 2016-10-08T13:22:41Z | 39,933,005 | <p>Perhaps consider using the <code>range</code> function and a <code>for-loop</code> within your while loop? The <code>range(stop, end)</code> function returns an array with integers from <code>stop</code> (inclusive) to <code>end</code> (exclusive). For ex: <code>range(0,3)</code> returns <code>[0, 1, 2]</code>. So i... | 0 | 2016-10-08T13:34:17Z | [
"python",
"python-2.7",
"while-loop"
] |
Aide in modifying this code removing the ' * ' operator and using while loops instead? | 39,932,875 | <p>How can I modify my code and remove the ' * ' operator which I have used to multiply strings and use while loops instead of it to produce the same pattern?</p>
<pre><code>i = 1
x = 1
while i <= 4:
print "v"*x
print "v"*x
x = x+1
i+=1
print "v"*5
b = 4
while b>=1:
print "v"*b
print "v"*... | -3 | 2016-10-08T13:22:41Z | 39,933,133 | <p>Hey this is the simplest way of doing this.</p>
<pre><code>length = 4
i = 0
output = "v"
for j in range(length-1):
print output + "\n" + output
output += "v"
print output
for j in range(length):
output = output[:-1]
print output + "\n" + output
</code></pre>
<p>Try this out. Hope this helps.</p>
<... | 1 | 2016-10-08T13:44:33Z | [
"python",
"python-2.7",
"while-loop"
] |
python re.search quantifier | 39,932,949 | <p>I have this:-</p>
<pre><code>re.search("^[47]{2:}$", '447447')
</code></pre>
<p>... and was expecting it to return True.
But somehow it does not.</p>
<p>How come?
My understanding is that it was suppose to match any number which has any combination of 4 or 7, with at least 2 digits.
Is that correct?</p>
| -1 | 2016-10-08T13:28:52Z | 39,932,990 | <p>It should probably be <code>"^[47]{2,}$"</code>.</p>
<p>I visit the <a href="https://docs.python.org/2/library/re.html#regular-expression-syntax" rel="nofollow">regular expression syntax</a> page quite often, because I find it hard to remember all of the little tricks for building regexes.</p>
| 3 | 2016-10-08T13:32:59Z | [
"python",
"regex",
"search"
] |
python re.search quantifier | 39,932,949 | <p>I have this:-</p>
<pre><code>re.search("^[47]{2:}$", '447447')
</code></pre>
<p>... and was expecting it to return True.
But somehow it does not.</p>
<p>How come?
My understanding is that it was suppose to match any number which has any combination of 4 or 7, with at least 2 digits.
Is that correct?</p>
| -1 | 2016-10-08T13:28:52Z | 39,933,011 | <p>The syntax is <code>{m,n}</code> where <em>n</em> could be omitted.</p>
<p>Fix:</p>
<pre><code>re.search("^[47]{2,}$", '447447')
</code></pre>
<p>See RegEx syntax: <a href="https://docs.python.org/3/library/re.html#regular-expression-syntax" rel="nofollow">https://docs.python.org/3/library/re.html#regular-express... | 2 | 2016-10-08T13:34:56Z | [
"python",
"regex",
"search"
] |
Python JWT and RSA | 39,932,977 | <p>I would like to learn about creating JWT using RSA public and private key. I am a beginner to learn securing my services. I am using pyjwt right now. I got something error with my testing, here it is:</p>
<p>SAMPLEKEY:</p>
<pre><code>privatekey = """-----BEGIN RSA PRIVATE KEY-----MIICXQIBAAKBgQCkC2AfenNMfrU4oMfMZt... | 0 | 2016-10-08T13:31:47Z | 39,933,122 | <p>This issue is reported on GitHub here: <a href="https://github.com/jpadilla/pyjwt/issues/81" rel="nofollow">https://github.com/jpadilla/pyjwt/issues/81</a></p>
<p>And marked as "closed". </p>
| 0 | 2016-10-08T13:43:48Z | [
"python",
"rsa",
"pyjwt"
] |
Python JWT and RSA | 39,932,977 | <p>I would like to learn about creating JWT using RSA public and private key. I am a beginner to learn securing my services. I am using pyjwt right now. I got something error with my testing, here it is:</p>
<p>SAMPLEKEY:</p>
<pre><code>privatekey = """-----BEGIN RSA PRIVATE KEY-----MIICXQIBAAKBgQCkC2AfenNMfrU4oMfMZt... | 0 | 2016-10-08T13:31:47Z | 39,933,301 | <p>Basically you'll want to switch the keys, use the private key for "encoding" (signing) and public for "decoding" (verification).</p>
| 0 | 2016-10-08T14:01:57Z | [
"python",
"rsa",
"pyjwt"
] |
how to generalize/get base directory for Linux path for python script | 39,933,116 | <p>(Linux)in Bash I can use variableName= cd $BASEDIR./Desktop to replace HOME/userName/Destop. How can I achieve the same in Python?</p>
<p>EXAMPLE:
need to replace home/name to be generic so that I can run this from multiple hosts.
f = open("home/name/directory/subdirectory/file.cfg", "r")</p>
| -1 | 2016-10-08T13:43:12Z | 39,933,164 | <p>Try to use commands libray.</p>
<pre><code>import commands
commands.getoutput("cd $BASEDIR./Desktop")
</code></pre>
| 0 | 2016-10-08T13:48:04Z | [
"python"
] |
how to generalize/get base directory for Linux path for python script | 39,933,116 | <p>(Linux)in Bash I can use variableName= cd $BASEDIR./Desktop to replace HOME/userName/Destop. How can I achieve the same in Python?</p>
<p>EXAMPLE:
need to replace home/name to be generic so that I can run this from multiple hosts.
f = open("home/name/directory/subdirectory/file.cfg", "r")</p>
| -1 | 2016-10-08T13:43:12Z | 39,933,181 | <p>You might get some use out of <a href="https://docs.python.org/2/library/os.path.html#os.path.expanduser" rel="nofollow"><code>os.path.expanduser</code></a> or <a href="https://docs.python.org/2/library/os.path.html#os.path.expandvars" rel="nofollow"><code>os.path.expandvars</code></a>:</p>
<pre><code>>>> ... | 1 | 2016-10-08T13:49:37Z | [
"python"
] |
how to generalize/get base directory for Linux path for python script | 39,933,116 | <p>(Linux)in Bash I can use variableName= cd $BASEDIR./Desktop to replace HOME/userName/Destop. How can I achieve the same in Python?</p>
<p>EXAMPLE:
need to replace home/name to be generic so that I can run this from multiple hosts.
f = open("home/name/directory/subdirectory/file.cfg", "r")</p>
| -1 | 2016-10-08T13:43:12Z | 39,933,304 | <p>You can read environment variables directly from <code>os.environ</code>:</p>
<pre><code>import os
basedir = os.environ.get('BASEDIR')
</code></pre>
<p>To construct a path reliably, the <code>os</code> module provides <code>os.path.join</code>. You should also provide a fallback if the variable is undefined. This ... | 1 | 2016-10-08T14:02:07Z | [
"python"
] |
Mac beeps when I type end parantheses in commented block of Python | 39,933,160 | <p>Why, when I type an end parantheses in a commented out area in IDLE, does mac sound the error beep, and how can I stop it?</p>
| 0 | 2016-10-08T13:47:47Z | 39,938,365 | <p>Various programs, including IDLE, sometimes ask the computer to 'beep' when the user does something that the program considers an error. In general, to not hear a beep, you can 1) stop doing whatever provokes the beep, 2) turn your speaker down or off, or 3) plug in earphones and not wear them while editing.</p>
| 0 | 2016-10-08T23:14:02Z | [
"python",
"osx",
"comments",
"python-idle",
"beep"
] |
Selection Sort-array sorting | 39,933,331 | <p>When I run it only the first smallest number gets sorted. Is the problem somewhere in the loops?</p>
<pre><code>def selectionSort(A):
n=len(A)
print(n)
mini=0
for i in range(0,n-2):
mini=i
for j in range(i+1,n-1):
if A[j]<A[mini]:
mini=j
if... | -1 | 2016-10-08T14:04:31Z | 39,933,403 | <p>There are actually two issues:</p>
<ol>
<li>Your second <code>if</code> should be outside the inner <code>for</code> loop.</li>
<li>And your outer and inner loop should be iterating till <code>n-1</code> and <code>n</code> respectively, instead of <code>n-2</code> and <code>n-1</code>.</li>
</ol>
<hr>
<p>Hence, y... | 0 | 2016-10-08T14:12:19Z | [
"python"
] |
Selection Sort-array sorting | 39,933,331 | <p>When I run it only the first smallest number gets sorted. Is the problem somewhere in the loops?</p>
<pre><code>def selectionSort(A):
n=len(A)
print(n)
mini=0
for i in range(0,n-2):
mini=i
for j in range(i+1,n-1):
if A[j]<A[mini]:
mini=j
if... | -1 | 2016-10-08T14:04:31Z | 39,933,409 | <p>Yes the problem is in the swapping part of your code, it needs to placed after inner for-loop</p>
<pre><code>def selectionSort(A):
n = len(A)
mini=0
for i in range(0,n-2):
mini=i
for j in range(i+1,n-1):
if A[j]<A[mini]:
mini=j
if i!=mini:
... | 0 | 2016-10-08T14:12:41Z | [
"python"
] |
Is it possible to mix literal words and tags in NLTK regex | 39,933,493 | <p>I'm experimenting with NLTK to help me parse some text. As an example I have:</p>
<pre><code>1 Robins Drive owned by Gregg S. Smith was sold to TeStER, LLC of 494 Bridge Avenue, Suite 101-308, Sheltville AZ 02997 for $27,000.00.
</code></pre>
<p>using:</p>
<pre><code>words =pos_tag(word_tokenize(sentence))
</code... | 0 | 2016-10-08T14:21:43Z | 39,935,194 | <p>if you combine each word and tag and then use <code>RegEx</code> to look for certain sequences of PoS tags you can get the results you are looking for.</p>
<p>for example, using the <code>words</code> variable you have defined</p>
<pre><code>joined = ' '.join([w+"<"+t+">" for w,t in words])
</code></pre>
<p... | 1 | 2016-10-08T17:20:39Z | [
"python",
"nltk"
] |
Alternate between add and subtract on a list of numbers | 39,933,509 | <p>How to get the sum of the series 1-2+3-4+5-6+7-8+9-10 in python? </p>
<p>I know how to get the sum of numbers from 1 to a particular number by using while loop in this way:</p>
<pre><code>i = 1
sum = 0
while i<= 10:
sum = sum + i
i = i + 1
print(sum)
</code></pre>
| 1 | 2016-10-08T14:23:06Z | 39,933,555 | <p>Given you are trying to alternate the sign you can use the fact that <code>(-1)**n</code> also alternates the sign. But you want a negative when <code>n</code> is even you will need <code>(-1)**(n-1)</code>:</p>
<pre><code>>>> list(n*(-1)**(n-1) for n in range(1, 11))
[1, -2, 3, -4, 5, -6, 7, -8, 9, -10]
&... | 2 | 2016-10-08T14:28:24Z | [
"python",
"list"
] |
Alternate between add and subtract on a list of numbers | 39,933,509 | <p>How to get the sum of the series 1-2+3-4+5-6+7-8+9-10 in python? </p>
<p>I know how to get the sum of numbers from 1 to a particular number by using while loop in this way:</p>
<pre><code>i = 1
sum = 0
while i<= 10:
sum = sum + i
i = i + 1
print(sum)
</code></pre>
| 1 | 2016-10-08T14:23:06Z | 39,933,560 | <p>You can use a generator expression like </p>
<pre><code>>>> sum(v if v%2 else -v for v in range(11))
-5
</code></pre>
<p>Here we check if the index is even or odd and add the number accordingly. </p>
<p>Another way can be using the <code>zip</code> builtin, But this works only for an even range. </p>
<p... | 2 | 2016-10-08T14:28:41Z | [
"python",
"list"
] |
Alternate between add and subtract on a list of numbers | 39,933,509 | <p>How to get the sum of the series 1-2+3-4+5-6+7-8+9-10 in python? </p>
<p>I know how to get the sum of numbers from 1 to a particular number by using while loop in this way:</p>
<pre><code>i = 1
sum = 0
while i<= 10:
sum = sum + i
i = i + 1
print(sum)
</code></pre>
| 1 | 2016-10-08T14:23:06Z | 39,933,573 | <p>your code need a very small change:</p>
<pre><code>i = 1
sum = 0
sign = 1
while i<= 10:
sum = sum + sign * i
sign = sign * -1
i = i + 1
print(sum)
</code></pre>
<p>There are more pythonic ways to do what you requested - but they will require a little more knowledge..</p>
| 1 | 2016-10-08T14:29:48Z | [
"python",
"list"
] |
Alternate between add and subtract on a list of numbers | 39,933,509 | <p>How to get the sum of the series 1-2+3-4+5-6+7-8+9-10 in python? </p>
<p>I know how to get the sum of numbers from 1 to a particular number by using while loop in this way:</p>
<pre><code>i = 1
sum = 0
while i<= 10:
sum = sum + i
i = i + 1
print(sum)
</code></pre>
| 1 | 2016-10-08T14:23:06Z | 39,933,582 | <p>You should do like:</p>
<pre><code>i = 1
my_sum = 0
while i<= 10:
if i % 2: # True, if i is divisible by 2
my_sum -= i
else:
my_sum += i
i += 1 # same as i = i + 1
</code></pre>
<p>Some other alternative approaches:</p>
<pre><code>>>> sum((i if i % 2 else -i) for i in r... | 1 | 2016-10-08T14:30:32Z | [
"python",
"list"
] |
Alternate between add and subtract on a list of numbers | 39,933,509 | <p>How to get the sum of the series 1-2+3-4+5-6+7-8+9-10 in python? </p>
<p>I know how to get the sum of numbers from 1 to a particular number by using while loop in this way:</p>
<pre><code>i = 1
sum = 0
while i<= 10:
sum = sum + i
i = i + 1
print(sum)
</code></pre>
| 1 | 2016-10-08T14:23:06Z | 39,933,631 | <p>It can also be seen as <code>sum of odd</code> minus <code>sum of even</code></p>
<pre><code>sum(range(1, 11, 2)) - sum(range(2, 11, 2))
</code></pre>
| 1 | 2016-10-08T14:36:15Z | [
"python",
"list"
] |
Alternate between add and subtract on a list of numbers | 39,933,509 | <p>How to get the sum of the series 1-2+3-4+5-6+7-8+9-10 in python? </p>
<p>I know how to get the sum of numbers from 1 to a particular number by using while loop in this way:</p>
<pre><code>i = 1
sum = 0
while i<= 10:
sum = sum + i
i = i + 1
print(sum)
</code></pre>
| 1 | 2016-10-08T14:23:06Z | 39,933,634 | <p>To expand this to a much easier, linear solution that works for any n series like this:</p>
<pre><code>def sum_subtract(n):
return n // 2 * -1 + n % 2 * n
</code></pre>
<p>Every pair of numbers (1 - 2) + (3 - 4) + etc. equals -1, so you just floor divide by 2 and multiply by -1. Next if there is an odd number ... | 1 | 2016-10-08T14:36:27Z | [
"python",
"list"
] |
Import serializer in models.py : Django rest framwork | 39,933,538 | <p>My one model class having following models,</p>
<p><strong>NewsfeedModel.py</strong></p>
<pre><code>class NewsFeed(models.Model):
class NewsStatus(models.Model):
class NewsImage(models.Model):
</code></pre>
<p>this is my serializers.py file</p>
<pre><code>from MadhaparGamApps.AppModels.NewsfeedModel import New... | 0 | 2016-10-08T14:25:51Z | 39,934,309 | <p>It seems like you are trying to Import NewsFeed model to itself.</p>
<p>The flow of a django-rest-framework looks like this:</p>
<p>Model > Serializer > View</p>
<p>After getting your serializers done all you need to do Is to import the models and serializers into the views.py file, in which you will create class... | 0 | 2016-10-08T15:46:17Z | [
"python",
"django",
"serialization",
"django-models",
"django-rest-framework"
] |
Import serializer in models.py : Django rest framwork | 39,933,538 | <p>My one model class having following models,</p>
<p><strong>NewsfeedModel.py</strong></p>
<pre><code>class NewsFeed(models.Model):
class NewsStatus(models.Model):
class NewsImage(models.Model):
</code></pre>
<p>this is my serializers.py file</p>
<pre><code>from MadhaparGamApps.AppModels.NewsfeedModel import New... | 0 | 2016-10-08T14:25:51Z | 40,043,340 | <p>The way to work around a circular import is to remove one of the imports from the module level and do it inside the method where it is used. </p>
<p>You haven't shown all the model code so I don't know where you use it, but if it's in <code>save</code> it would look like this:</p>
<pre><code>def save(self, **kwarg... | 1 | 2016-10-14T12:36:36Z | [
"python",
"django",
"serialization",
"django-models",
"django-rest-framework"
] |
Non-greedy matching of Word in pyparsing? | 39,933,553 | <p>I would like to match a word that ends with either <code>_foo</code> or <code>_bar</code>. I wrote this: </p>
<pre><code>identifier = Word(alphanums + '_')
string = identifier + Suppress('_') + oneOf('foo bar')
</code></pre>
<p>Unfortunately, I realized <code>identifier</code> is greedy and consume all the key... | 2 | 2016-10-08T14:28:01Z | 39,934,768 | <p>Once you know for what you're looking, you can use <a href="http://pyparsing.wikispaces.com/share/view/1552279" rel="nofollow"><code>pp.SkipTo</code></a>:</p>
<pre><code>In [38]: foo_or_bar = Literal('foo') | Literal('bar')
In [39]: string = SkipTo(Literal('_') + foo_or_bar) + Literal('_') + foo_or_bar
In [42]: s... | 2 | 2016-10-08T16:35:44Z | [
"python",
"pyparsing",
"non-greedy"
] |
Non-greedy matching of Word in pyparsing? | 39,933,553 | <p>I would like to match a word that ends with either <code>_foo</code> or <code>_bar</code>. I wrote this: </p>
<pre><code>identifier = Word(alphanums + '_')
string = identifier + Suppress('_') + oneOf('foo bar')
</code></pre>
<p>Unfortunately, I realized <code>identifier</code> is greedy and consume all the key... | 2 | 2016-10-08T14:28:01Z | 39,935,874 | <p>If you have to/can switch to the re api you can use non-greedy matching there:</p>
<pre><code> import re
p = re.compile (r"""([a-z_]+?) # lazy matching identifier
_ (bar|foo) # _ with foo or bar
""", re.VERBOSE)
subject_string = 'a_hello_foo'
m = p.match( s... | 1 | 2016-10-08T18:28:18Z | [
"python",
"pyparsing",
"non-greedy"
] |
MultiProcessing slower with more processes | 39,933,568 | <p>I have a program written in python that reads 4 input text files and writes all of them into a list called <code>ListOutput</code> which is a shared memory between 4 processes used in my program (I used 4 processes so my program runs faster!)</p>
<p>I also have a shared memory variable called <code>processedFiles</... | 2 | 2016-10-08T14:29:19Z | 39,933,783 | <p>The problem is that what <em>looks</em> like multiprocessing often isn't. Just using more cores doesn't mean doing more work.</p>
<p>The most glaring problem is that you synchronize everything. Selecting files is sequential because you lock, so there is zero gain here. While you are reading in parallel, every line ... | 4 | 2016-10-08T14:51:32Z | [
"python",
"multithreading",
"multiprocessing"
] |
MultiProcessing slower with more processes | 39,933,568 | <p>I have a program written in python that reads 4 input text files and writes all of them into a list called <code>ListOutput</code> which is a shared memory between 4 processes used in my program (I used 4 processes so my program runs faster!)</p>
<p>I also have a shared memory variable called <code>processedFiles</... | 2 | 2016-10-08T14:29:19Z | 39,933,916 | <p>Just to add to existing answer, there are certain cases where using <code>multiprocessing</code> really adds value and saves time:</p>
<ol>
<li>Your program does <em>N</em> tasks, which are independent of each other.</li>
<li>Your program does extensive heavy mathematical calculations</li>
<li>As a gotcha to second... | 2 | 2016-10-08T15:05:37Z | [
"python",
"multithreading",
"multiprocessing"
] |
Python - PyQt Signals - Emit and send argument to different class | 39,933,593 | <p>This is only my second question here so please do bear with me. I have a python script that currently contains two classes. One of which manages a GUI and the other is my 'worker thread' (a pyqt thread) . In order for me to be able to update the GUI from the 'worker thread' I understand that I can setup pyqt signals... | 0 | 2016-10-08T14:31:46Z | 39,933,960 | <pre><code>#!/usr/bin/python3
# -*- coding: utf-8 -*-
import time
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QProgressBar
from PyQt5.QtCore import QThread, pyqtSignal
class Thread(QThread):
progress = pyqtSignal(int)
def __init__(self):
super(Thread, self).__init__()
def __de... | 0 | 2016-10-08T15:10:04Z | [
"python",
"multithreading",
"signals-slots"
] |
TypeError: relative imports require the package argument in python | 39,933,604 | <p>I just started learning Python(2.7) and facing an issue. I am using windows 10.</p>
<p>I have created a virtual environment(c:\virtualenvs\testenv) and activated it. My app folder path is c:\pyprojects\pytest. This folder has got requirements.txt with all the packages listed.</p>
<p>The prompt looks like</p>
<pre... | 0 | 2016-10-08T14:33:07Z | 39,934,050 | <p>DJANGO_SETTINGS_MODULE is expected to be a Python module identifier, not a filesystem path. Looking at the django/conf/__init__py file, it seems that a relative path to your settings module won't work there. You will need to move it below a directory listed in your sys.path, or you should add a parent directory to y... | 0 | 2016-10-08T15:19:10Z | [
"python",
"django",
"python-2.7"
] |
how to check in a pandas DataFrame entry exists by (index, column) | 39,933,630 | <p>I have searched and searched but I can't find how to test whether a pandas data frame entry exists by (index, column).</p>
<p>for example:</p>
<pre><code>import pandas
df = pandas.DataFrame()
df.ix['apple', 'banana'] = 0.1
df.ix['apple', 'orange'] = 0.1
df.ix['kiwi', 'banana'] = 0.2
df.ix['kiwi', 'orange'] = 0.7
... | 1 | 2016-10-08T14:36:11Z | 39,933,808 | <p>You can check for the existence in index and columns:</p>
<pre><code>('kiwi' in df.index) and ('apple' in df.columns)
</code></pre>
<p>Or you can use a try/except block:</p>
<pre><code>try:
df.ix['kiwi', 'apple'] += some_value
except KeyError:
df.ix['kiwi', 'apple'] = some_value
</code></pre>
<p>Note tha... | 0 | 2016-10-08T14:54:22Z | [
"python",
"pandas"
] |
unorderable types: dict() <= int() in running OneVsRest Classifier | 39,933,633 | <p>I am running a multilabel classification on the input data with 330 features and about 800 records. I am leveraging RandomForestClassifier with following param_grid:</p>
<pre><code>> param_grid = {"n_estimators": [20],
> "max_depth": [6],
> "max_features": [80, 150],
> ... | 0 | 2016-10-08T14:36:23Z | 39,938,000 | <p>Why are you trying to initialize RandomForestClassifier with parameter grid?</p>
<p>If you want to do a Grid Search - look at examples here:
<a href="http://scikit-learn.org/stable/modules/generated/sklearn.model_selection.GridSearchCV.html#sklearn.model_selection.GridSearchCV" rel="nofollow">http://scikit-learn.or... | 1 | 2016-10-08T22:25:39Z | [
"python",
"scikit-learn",
"sklearn-pandas"
] |
python raspberry pi digital dashboard for electric car | 39,933,648 | <p>For my master thesis we are building an electric car. For this I need to create a digital dash to show speed, rpm of the electric motor, temperatures,...</p>
<p>I can program in python, but no experience in creating a interface like this. I searched on the internet for examples of digital dashes and found some nice... | 0 | 2016-10-08T14:37:30Z | 39,933,851 | <p>Try wxpython for the UI design. Works great.
Recently I've designed a UI for Raspi on wxpython itself.</p>
<p>have a look</p>
<p><a href="https://www.dropbox.com/s/f83dkc9hjhdbbdk/14632693_1206330069428934_64955080_o.png?dl=0" rel="nofollow">https://www.dropbox.com/s/f83dkc9hjhdbbdk/14632693_1206330069428934_64955... | 1 | 2016-10-08T14:59:00Z | [
"python",
"raspberry-pi",
"pyqt5"
] |
Cassandra sometimes throws unauthorized error | 39,933,659 | <p>We have a multi-node Cassandra cluster and we use Cassandra python driver for our insert queries. Everything was fine till we removed one of our nodes from the cluster using following command:</p>
<pre><code>nodetool removenode force
</code></pre>
<p>Now our driver meets following error not always but once in a w... | 1 | 2016-10-08T14:38:17Z | 39,936,452 | <p>Since you forced a remove node data may now be inconsistent you should start with a repair on the <code>system_auth</code> keyspace.</p>
<p>I would then follow up with a full repair of all the other keyspaces.</p>
| 2 | 2016-10-08T19:24:38Z | [
"python",
"cassandra",
"unauthorized"
] |
Implementing raw input in a method | 39,933,701 | <p>I have the following class below but struggling to make the script work as intended. </p>
<pre><code>class firstClass:
def test(self):
enter = raw_input()
books = enter.split()
books = []
for index in range(len(books)):
print 'Current Books :', books[index]
mybooks = firstClass()... | 0 | 2016-10-08T14:42:04Z | 39,933,759 | <p>You are setting <code>books</code> properly with the line <code>books = enter.split()</code>. The next line <code>books = []</code> <em>overwrites</em> this value with an empty array, so the loop never happens. </p>
<p>Removing that one line, it works as expected:</p>
<pre><code>>>> class firstClass:
... ... | 1 | 2016-10-08T14:48:15Z | [
"python",
"python-2.7"
] |
Implementing raw input in a method | 39,933,701 | <p>I have the following class below but struggling to make the script work as intended. </p>
<pre><code>class firstClass:
def test(self):
enter = raw_input()
books = enter.split()
books = []
for index in range(len(books)):
print 'Current Books :', books[index]
mybooks = firstClass()... | 0 | 2016-10-08T14:42:04Z | 39,933,770 | <p>Just remove 5th line, your code will work fine.</p>
<pre><code>class firstClass:
def test(self):
enter = raw_input()
books = enter.split()
for index in range(len(books)):
print 'Current Books :', books[index]
mybooks = firstClass()
mybooks.test()
</code></pre>
| 0 | 2016-10-08T14:49:52Z | [
"python",
"python-2.7"
] |
Selecting a pandas dataframe by name string generated within the code | 39,933,704 | <p>I'm writing up few lines in python where I have created 3 pandas dataframes
DF_A, dF_B, dF_C.
In the next step I do something & read a string. If the string = 'A' then I want to go to dF_A(& so on for B&C).
Any help on how this can be done?</p>
<pre><code>DF = pd.ExcelFile('File.xlsx')
DF_A = Dev.parse(... | 0 | 2016-10-08T14:42:23Z | 39,933,791 | <p>It is possible to use <code>vars()</code>, though it's hacky</p>
<pre><code>for i in tmp: # do not iterate by index
table = vars()['DF_' + i]
</code></pre>
<p>It is cleaner to just store tables in a dictionary in the first place</p>
<pre><code>tables = {}
for i in ['A', 'B', 'C']:
tables[i] = Dev.parse(i... | 1 | 2016-10-08T14:52:21Z | [
"python",
"pandas"
] |
Consecutive values? | 39,933,813 | <p>Learning python, but having trouble telling function to find consecutive locations with same values. When I run the code, there's no errors but gives out the incorrect output. Suggestions on what to change?</p>
<pre><code>def same_values(xs):
same = False
for i in (xs):
if xs == xs[1:]:
... | 0 | 2016-10-08T14:55:08Z | 39,933,877 | <p>So you are looking for a consecutive pair in the list and returning true if you find one. </p>
<pre><code>def same_values(xs):
for i in range(len(xs)-1):
if xs[i] == xs[i+1]:
return True
return False
>>> same_values('misses')
True
>>> same_values('mises')
False
</code>... | 3 | 2016-10-08T15:01:29Z | [
"python",
"function"
] |
Importing image into Tkinter - Python 3.5 | 39,933,831 | <p>I'm majorly struggling to import an image into <strong>Tkinter</strong> for <strong>Python 3.5</strong>, this is for my A2 project and have hit a brick wall with every method of <strong>importing a .JPG file</strong> to my window. What I have below is my GUI layer for another window, based off another thread I found... | -1 | 2016-10-08T14:57:14Z | 39,937,321 | <p>First check the path if with the correct path still persist the error "no such file or directory" please edit and put the newest version of your code.
If the error is "couldn't recognize data in image file" you can correct using PIL</p>
<pre><code> [...]
from PIL import ImageTk
[...]
photo = ImageTk.PhotoImage... | 0 | 2016-10-08T21:00:45Z | [
"python",
"image",
"import",
"tkinter",
"tk"
] |
trying to sort a user input list | 39,933,862 | <p>Im new at python. Im creating a script that allows a user to input three names and then the code should print the names and then print them sorted (alphabetically). I can get the code to return the sorted individual letters, but not the full names as strings. I really want to run AS A LOOP!!!here is what i have s... | 0 | 2016-10-08T15:00:43Z | 39,934,845 | <pre><code>print "Enter three names\n"
a = raw_input("Enter first name: ")
b = raw_input("Enter second name: ")
c = raw_input("Enter third name: ")
names = [a, b, c]
print a, b, c
for name in sorted(names):
print name
</code></pre>
| 0 | 2016-10-08T16:44:05Z | [
"python",
"loops",
"sorting"
] |
trying to sort a user input list | 39,933,862 | <p>Im new at python. Im creating a script that allows a user to input three names and then the code should print the names and then print them sorted (alphabetically). I can get the code to return the sorted individual letters, but not the full names as strings. I really want to run AS A LOOP!!!here is what i have s... | 0 | 2016-10-08T15:00:43Z | 39,935,093 | <p>you can use a list in python it has a good function called sort you can call it from list code
<br></p>
<pre><code>print ('Enter three names, when done hit enter with a blank: ')
a = (raw_input('enter first name: '))
b = (raw_input('enter first name: '))
c = (raw_input('enter first name: '))
my_list = [a,b,c]
m... | 1 | 2016-10-08T17:10:35Z | [
"python",
"loops",
"sorting"
] |
variables not defined in if statements for change counting program | 39,933,883 | <p>I'm making a change counter and I'm having trouble printing the percentage for a grade, whenever I run the program I can enter as many inputs as I want, however, when I type done, which is supposed to terminate the program and leave the user with the percentage and letter grade, it just ends the program. If I could ... | 1 | 2016-10-08T15:02:07Z | 39,934,094 | <p>Your conditional logic is flawed. You are never assessing the grade (<code>letter</code>) if the <code>score.isdigit()</code>:</p>
<pre><code>while scores != 'done':
scores=input("Enter Homework score: ")
if scores.isdigit():
numeric=int(scores)
percentage=(numeric*10/count)
if perce... | 2 | 2016-10-08T15:24:44Z | [
"python"
] |
variables not defined in if statements for change counting program | 39,933,883 | <p>I'm making a change counter and I'm having trouble printing the percentage for a grade, whenever I run the program I can enter as many inputs as I want, however, when I type done, which is supposed to terminate the program and leave the user with the percentage and letter grade, it just ends the program. If I could ... | 1 | 2016-10-08T15:02:07Z | 39,934,204 | <p>Your code should look similar to the one below. Although I still cannot assess the logic behind your program (because you did not explain that in your question, e.g. <code>percentage=(numeric*10/count)</code> does not seem quite right to me, etc.), but the code below solves your current problem (based on your curren... | 0 | 2016-10-08T15:36:10Z | [
"python"
] |
Some cases cause my binary search to enter into an Infinite loop | 39,933,884 | <p>I'm stuck in an infinite loop when searching for anything that is not in the list (but within the range of the list) and anything that is greater than the highest number. For example, when searching for 2 in the list <code>[1,2,5,6]</code>, my function returns index 1, which is correct. If I search for -1, it return... | 2 | 2016-10-08T15:02:10Z | 39,933,925 | <p>In a return under condition <code>a_list[mid] < item</code> change the line</p>
<pre><code>return binary_search(a_list[mid:], item) + mid
</code></pre>
<p>To the line</p>
<pre><code>return binary_search(a_list[mid+1:], item)
</code></pre>
<p>Now the <code>mid</code> element gets included to the new list</p>
... | 1 | 2016-10-08T15:06:22Z | [
"python",
"binary-search"
] |
Some cases cause my binary search to enter into an Infinite loop | 39,933,884 | <p>I'm stuck in an infinite loop when searching for anything that is not in the list (but within the range of the list) and anything that is greater than the highest number. For example, when searching for 2 in the list <code>[1,2,5,6]</code>, my function returns index 1, which is correct. If I search for -1, it return... | 2 | 2016-10-08T15:02:10Z | 39,934,083 | <p>Try this.</p>
<pre><code>def binary_search(a_list, item):
if not a_list:
return False
mid = len(a_list)//2
print "Middle is: {}".format(a_list[mid])
print a_list
while len(a_list) > 0:
if len(a_list) == 1 and a_list[mid] != item:
return False
elif a_li... | 0 | 2016-10-08T15:23:28Z | [
"python",
"binary-search"
] |
Some cases cause my binary search to enter into an Infinite loop | 39,933,884 | <p>I'm stuck in an infinite loop when searching for anything that is not in the list (but within the range of the list) and anything that is greater than the highest number. For example, when searching for 2 in the list <code>[1,2,5,6]</code>, my function returns index 1, which is correct. If I search for -1, it return... | 2 | 2016-10-08T15:02:10Z | 39,934,554 | <p>Here is the code I used to examine your program. <code>pdb</code> allows you to step through the code one command at a time using <code>s</code> or continue to the next <code>pdb.set_trace()</code> using <code>c</code>. You use it like this:</p>
<pre><code>import pdb
def binary_search(a_list, item):
if not a_... | 1 | 2016-10-08T16:14:03Z | [
"python",
"binary-search"
] |
UPLOAD file to django | 39,934,078 | <p>I try to upload a file to django from html through an ajax call.</p>
<p>CLIENT SIDE:</p>
<pre><code><input type="file" class="text-field" name="media">
<input type="button" class="btn" value="SEND">
var files;
$('.text-field').change(function(){
files = this.files;
... | 1 | 2016-10-08T15:21:56Z | 39,934,230 | <p>To upload a file through Django, you will most likely have to use django forms. Here is an example as for how to upload a file:</p>
<pre><code>def upload_file(request):
if request.method == 'POST':
form = UploadFileForm(request.POST, request.FILES)
if form.is_valid():
instance = ModelWithFileField(f... | 0 | 2016-10-08T15:38:26Z | [
"python",
"django",
"file"
] |
Object is not callable | 39,934,169 | <p>I make this condition:</p>
<pre><code>if ((liste_mois[0]==3) or (liste_mois[0]==6) (liste_mois[0]==9) or (liste_mois[0]==12))
</code></pre>
<p>i got: TypeError: 'bool' object is not callable</p>
| 0 | 2016-10-08T15:31:39Z | 39,934,217 | <p>you missed an "or" in between.</p>
| 1 | 2016-10-08T15:37:07Z | [
"python",
"python-2.7",
"odoo-8"
] |
Object is not callable | 39,934,169 | <p>I make this condition:</p>
<pre><code>if ((liste_mois[0]==3) or (liste_mois[0]==6) (liste_mois[0]==9) or (liste_mois[0]==12))
</code></pre>
<p>i got: TypeError: 'bool' object is not callable</p>
| 0 | 2016-10-08T15:31:39Z | 39,934,286 | <p>You've got:</p>
<blockquote>
<p>TypeError: 'bool' object is not callable</p>
</blockquote>
<p>just because you're doing something like that:</p>
<pre><code>(liste_mois[0]==6) (liste_mois[0]==9)
</code></pre>
<p>which could be represented as, let's say:</p>
<pre><code>(True) (False)
</code></pre>
<p>and going... | 1 | 2016-10-08T15:44:02Z | [
"python",
"python-2.7",
"odoo-8"
] |
Python: remove files older than X days | 39,934,173 | <p>I have this script to remove all images from a server directory:</p>
<pre><code>import ftplib
ftp = ftplib.FTP("server", "user", "pass")
files = ftp.dir('/')
ftp.cwd("/html/folder/")
filematch = '*.jpg'
target_dir = '/html/folder'
import os
for filename in ftp.nlst(filematch):
ftp.delete(filename)
</code></pre>
... | 0 | 2016-10-08T15:32:29Z | 39,934,341 | <p>In python 3.3+ was added <code>mlsd</code> command support, which allows you to get the <code>facts</code> as well as list the directory.</p>
<p>So your code should be like this:</p>
<pre><code>filematch = '.jpg'
target_dir = '/html/folder'
import os
for filename, create, modify in ftp.mlsd(target_dir, facts=['cr... | 0 | 2016-10-08T15:50:15Z | [
"python",
"ftp"
] |
fors in python list comprehension | 39,934,187 | <p>Consider I have nested for loop in python list comprehension</p>
<pre><code>>>> data = [[0, 1, 2], [3, 4, 5], [6, 7, 8]]
>>> [y for x in data for y in x]
[0, 1, 2, 3, 4, 5, 6, 7, 8]
>>> [y for y in x for x in data]
[6, 6, 6, 7, 7, 7, 8, 8, 8]
</code></pre>
<p>I can't explain why is that ... | 4 | 2016-10-08T15:34:25Z | 39,934,209 | <p>It's holding the value of the previous comprehsension. Try inverting them, you'll get an error</p>
<pre><code>>>> data = [[0, 1, 2], [3, 4, 5], [6, 7, 8]]
>>> [y for y in x for x in data]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'x' is no... | 6 | 2016-10-08T15:36:21Z | [
"python",
"list",
"python-2.7",
"for-loop",
"list-comprehension"
] |
fors in python list comprehension | 39,934,187 | <p>Consider I have nested for loop in python list comprehension</p>
<pre><code>>>> data = [[0, 1, 2], [3, 4, 5], [6, 7, 8]]
>>> [y for x in data for y in x]
[0, 1, 2, 3, 4, 5, 6, 7, 8]
>>> [y for y in x for x in data]
[6, 6, 6, 7, 7, 7, 8, 8, 8]
</code></pre>
<p>I can't explain why is that ... | 4 | 2016-10-08T15:34:25Z | 39,934,236 | <p>The list comprehensions are as:</p>
<pre><code>[y for x in data for y in x]
[y for y in x for x in data]
</code></pre>
<p>A <code>for</code> loop conversion of <code>[y for y in x for x in data]</code> is:</p>
<pre><code>for y in x:
for x in data:
y
</code></pre>
<p>Here <code>x</code> is holding the... | 2 | 2016-10-08T15:38:41Z | [
"python",
"list",
"python-2.7",
"for-loop",
"list-comprehension"
] |
Plotting Smith chart using PySmithPlot | 39,934,233 | <p>I'm trying to plot Smith chart in python using PySmithPlot, it has to be placed along some other items in frame, but i can't find a way to do so.
I have managed to make plots with matplotlib, but didn't have any luck so far with Smiths chart. Can anyone give me a reference to a site where i could find explanation t... | -1 | 2016-10-08T15:38:31Z | 39,935,375 | <p><code>PySmithPlot</code> provides a new <code>projection</code> which you can pass to e.g. <code>subplot()</code> or <code>add_subplot()</code>:</p>
<pre><code>import matplotlib.pylab as pl
import smithplot
from smithplot import SmithAxes
fig = pl.figure()
ax1 = fig.add_subplot(121)
ax1.plot([(1, 2), (3, 4)], [... | 0 | 2016-10-08T17:37:33Z | [
"python",
"matplotlib"
] |
Python Ephem sunset and sunrise | 39,934,242 | <p>I am trying to calculate the exact amount of daylight hours for a given day and location. I have been looking at the python module "Ephem" for the sunrise and set calculation. Here is the code below:</p>
<pre><code>import ephem
California_forest = ephem.Observer()
California_forest.date = '2001/01/01 00:00'
Califor... | 2 | 2016-10-08T15:39:02Z | 39,934,363 | <p>What you really what is the string representation of your object. If you must get the string representation of it, then call the <code>__str__()</code> special method as follows.</p>
<pre><code>sunrise = California_forest.previous_rising(ephem.Sun()).__str__()
sunrise
'2000/12/31 15:21:06'
sunset = California_fore... | 1 | 2016-10-08T15:53:29Z | [
"python",
"pyephem"
] |
Python Ephem sunset and sunrise | 39,934,242 | <p>I am trying to calculate the exact amount of daylight hours for a given day and location. I have been looking at the python module "Ephem" for the sunrise and set calculation. Here is the code below:</p>
<pre><code>import ephem
California_forest = ephem.Observer()
California_forest.date = '2001/01/01 00:00'
Califor... | 2 | 2016-10-08T15:39:02Z | 39,934,407 | <p>It looks like this is returning an <code>ephem._libastro.Date</code> object, which, when <a href="https://github.com/brandon-rhodes/pyephem/blob/master/extensions/_libastro.c#L502" rel="nofollow">convrted to <code>str</code></a> returns the nicely formatted string you see when printing it.</p>
<p>If you just enter ... | 2 | 2016-10-08T15:58:24Z | [
"python",
"pyephem"
] |
Implementation of Divisive Clustering | 39,934,252 | <p>I'm referring to this <a href="http://www.cs.utexas.edu/users/inderjit/public_papers/hierdist.pdf" rel="nofollow">paper</a>. In that paper they are clustering words before classifying the document</p>
<p>They say that from a document set with vocabulary size of 35000, they have been able to classify the documents a... | -2 | 2016-10-08T15:39:51Z | 39,940,964 | <p>Implement it yourself (questions asking for code/libraries are off-topic here!). Figure 1 is the pseudo-code of the proposed algorithm.</p>
| 0 | 2016-10-09T07:08:32Z | [
"python",
"algorithm",
"nlp",
"cluster-analysis",
"hierarchical-clustering"
] |
How to divide file into several files using python | 39,934,298 | <p>I have a video file and i need to <strong>divide</strong> it into several smaller files of size <strong>256KB</strong> and save all files names in a text file then i need to read all the small files and <strong>merges</strong> them into the original file.</p>
<p>is this possible to do it in <strong>python</strong> ... | 0 | 2016-10-08T15:45:30Z | 39,934,510 | <p>First stab at splitting:</p>
<pre><code>input_file = open(input_filename, 'rb')
blocksize = 4096
chunksize = 1024 * 256
buf = None
chunk_num = 0
current_read = 0
output_filename = 'output-chunk-{:04d}'.format(chunk_num)
output_file = open(output_filename, 'wb')
while buf is None or len(buf) > 0:
buf = input_... | 1 | 2016-10-08T16:08:43Z | [
"python",
"python-2.7",
"python-3.x"
] |
Python 3 Beautiful Soup find tag with colon | 39,934,304 | <p>I am trying to scrape this site and get two separate tags. This is what the html looks like.</p>
<pre><code><url>
<loc>
http://link.com
</loc>
<lastmod>date</lastmode>
<changefreq>daily</changefreq>
<image:image>
<image:loc>
https://imagelin... | 1 | 2016-10-08T15:45:59Z | 39,934,355 | <p>You should parse it in <a href="https://www.crummy.com/software/BeautifulSoup/bs4/doc/#installing-a-parser" rel="nofollow">"xml" mode</a> instead (requires <code>lxml</code> to be installed as well):</p>
<pre><code>from bs4 import BeautifulSoup
data = """
<url>
<loc>
http://link.com
</loc>... | 1 | 2016-10-08T15:52:38Z | [
"python",
"python-3.x",
"tags",
"beautifulsoup",
"bs4"
] |
Construct a data structure with special requirements in python | 39,934,347 | <p>Requirements:</p>
<ol>
<li>There is a variable, for example, related_to_dict = 10</li>
<li>Construct a key value pair data, for example, special_dict = {0 :
ref_related_to_dict}</li>
<li>When the variable of related_to_dict changed, the value of
special_dict[0] also changed to the value of related_to_dict
according... | 0 | 2016-10-08T15:50:55Z | 39,934,378 | <p>You need to wrap the value in some sort of container. </p>
<pre><code>class Ref:
def __init__(self, v):
self.val = v
</code></pre>
<p>And then:</p>
<pre><code>related_to_dict = Ref(10)
special_dict = {0: related_to_dict}
</code></pre>
<p>Then it works as desired:</p>
<pre><code>related_to_dict.val = ... | 1 | 2016-10-08T15:55:10Z | [
"python",
"data-structures"
] |
Python getting last line | 39,934,453 | <p>Working on a monitoring project, I need to count pulses from pulse meters. I've already found some solutions, which I've been trying to adapt to my needs. </p>
<p>Here is the python script, running on a Raspberry Pi :</p>
<pre><code>#!/usr/bin/env python
import RPi.GPIO as GPIO
import datetime
import sys
import s... | 0 | 2016-10-08T16:02:50Z | 39,934,640 | <p>To read the last line of a big file, pick a position near the end of the file and read. If there are no newlines there, go back a little and read again.</p>
<p>Then find the last newline and the rest is your last line.</p>
<pre><code>EXPECTED_MAX_LINE_SIZE = 500 # this should be both small enough and big enough
... | 0 | 2016-10-08T16:21:52Z | [
"python",
"search",
"raspberry-pi",
"pulse"
] |
Python getting last line | 39,934,453 | <p>Working on a monitoring project, I need to count pulses from pulse meters. I've already found some solutions, which I've been trying to adapt to my needs. </p>
<p>Here is the python script, running on a Raspberry Pi :</p>
<pre><code>#!/usr/bin/env python
import RPi.GPIO as GPIO
import datetime
import sys
import s... | 0 | 2016-10-08T16:02:50Z | 39,934,779 | <p>Your logic is way over complicated, if you will be running the script different times just store the last index in a separate file constantly overwriting:</p>
<pre><code> def next_index(index):
with open(index, 'a+') as f: # open for reading. If it does not exist, create it
val = int(next(f, -1)) + 1 #... | 0 | 2016-10-08T16:37:02Z | [
"python",
"search",
"raspberry-pi",
"pulse"
] |
Python getting last line | 39,934,453 | <p>Working on a monitoring project, I need to count pulses from pulse meters. I've already found some solutions, which I've been trying to adapt to my needs. </p>
<p>Here is the python script, running on a Raspberry Pi :</p>
<pre><code>#!/usr/bin/env python
import RPi.GPIO as GPIO
import datetime
import sys
import s... | 0 | 2016-10-08T16:02:50Z | 39,941,876 | <p>I don't think that was what Padraic Cunningham meant, but I've managed to solve my problem by using two files, one for logging the updated index value, and one for storing the values :</p>
<pre><code>#!/usr/bin/env python
import RPi.GPIO as GPIO
import datetime
import sys
import signal
#verbose = True # globa... | 0 | 2016-10-09T09:10:12Z | [
"python",
"search",
"raspberry-pi",
"pulse"
] |
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