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python Programming Glossary: trueWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python to a class print hasattr ObjectCreator 'new_attribute' True print ObjectCreator.new_attribute foo ObjectCreatorMirror ObjectCreator.. the attributes of the class. So class Foo object ... bar True Can be translated to Foo type 'Foo' 'bar' True And used as a.. ... bar True Can be translated to Foo type 'Foo' 'bar' True And used as a normal class print Foo class '__main__.Foo' print..
Fastest way to list all primes below N in python http://stackoverflow.com/questions/2068372/fastest-way-to-list-all-primes-below-n-in-python million 529 in get_primes 1000 False 529 in get_primes 530 True EDIT The rank so far pure python no external sources all primes.. in python 3035188#3035188 Returns a list of primes n sieve True n for i in xrange 3 int n 0.5 1 2 if sieve i sieve i i 2 i False.. in python 3035188#3035188 Returns a list of primes n sieve True n 2 for i in xrange 3 int n 0.5 1 2 if sieve i 2 sieve i i 2..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained in range 5 ' 100' ' 100' ' 100' ' 100' ' 100' hsbc.crisis True # crisis is coming no more money print corner_street_atm.next..
Python “is” operator behaves unexpectedly with integers http://stackoverflow.com/questions/306313/python-is-operator-behaves-unexpectedly-with-integers following behave unexpectedly in Python a 256 b 256 a is b True # this is an expected result a 257 b 257 a is b False # what.. b False # what happened here why is this False 257 is 257 True # yet the literal numbers compare properly I am using Python..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python code that describe how to produce an object. That's kinda true in Python too class ObjectCreator object ... pass ... my_object..
Is there a difference between `==` and `is` in python? http://stackoverflow.com/questions/132988/is-there-a-difference-between-and-is-in-python 'Yay ' two tests for equality equivalent ha Does this hold true for objects where you would be comparing instances a list say.. my question L L.append 1 if L 1 print 'Yay ' # Holds true but... if L is 1 print 'Yay ' # Doesn't. So tests value where.. not work 1000 is 10 3 False 1000 10 3 True The same holds true for string literals a is a True aa is a 2 True x a aa is x 2..
Difference between __str__ and __repr__ in Python http://stackoverflow.com/questions/1436703/difference-between-str-and-repr-in-python Python cops out. Note that there is one default which is true if __repr__ is defined and __str__ is not the object will behave..
http://stackoverflow.com/questions/15112125/if-x-or-y-or-z-blah 0 x or y or z would resolve to 2 because that is the first true like value in the arguments. Then 2 1 would be False even though..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained wall_street_atm hsbc.create_atm # it's even true for new ATMs print wall_street_atm.next type 'exceptions.StopIteration'..
Is False == 0 and True == 1 in Python an implementation detail or is it guaranteed by the language? http://stackoverflow.com/questions/2764017/is-false-0-and-true-1-in-python-an-implementation-detail-or-is-it-guarante a __index__ method thanks mark dickinson . Edit It is true of the current python version and of that of Python 3. The docs..
String comparison in Python: is vs. == [duplicate] http://stackoverflow.com/questions/2988017/string-comparison-in-python-is-vs But usually identity implies equality. The converse is not true Two distinct objects can have the same value. Also is it generally..
Is it Pythonic to use bools as ints? http://stackoverflow.com/questions/3174392/is-it-pythonic-to-use-bools-as-ints simplify your code is perfectly fine. Historically logical true false operations tended to simply use 0 for false and 1 for.. operations tended to simply use 0 for false and 1 for true in the course of Python 2.2's life cycle Guido noticed that.. too many modules started with assignments such as false 0 true 1 and this produced boilerplate and useless variation the latter..
How do I determine the size of an object in Python? http://stackoverflow.com/questions/449560/how-do-i-determine-the-size-of-an-object-in-python will return correct results but this does not have to hold true for third party extensions as it is implementation specific...
Dynamically adding a form to a Django formset with Ajax http://stackoverflow.com/questions/501719/dynamically-adding-a-form-to-a-django-formset-with-ajax cloneMore selector type var newElement selector .clone true var total '#id_' type ' TOTAL_FORMS' .val newElement.find '..
mkdir -p functionality in python http://stackoverflow.com/questions/600268/mkdir-p-functionality-in-python has an optional third argument exist_ok that when true enables the mkdir p functionality em unless mode is provided..
Converting datetime.date to UTC timestamp in Python http://stackoverflow.com/questions/8777753/converting-datetime-date-to-utc-timestamp-in-python td.seconds td.days 24 3600 10 6 10 6 computed with true division enabled. Example from datetime import datetime timedelta..
Adding a Method to an Existing Object http://stackoverflow.com/questions/972/adding-a-method-to-an-existing-object I tried it but it appears that it ends up being not a true method. Your example defines the new patch function with an.. just class.patch if you want the same functionality as a true method. It looks like python isn't really treating it as a method..
Why does Python say this Netscape cookie file isn't valid? http://stackoverflow.com/questions/11529428/why-does-python-say-this-netscape-cookie-file-isnt-valid by libcurl Edit at your own risk. .scholar.google.com TRUE FALSE 2147483647 GSP ID 353e8f974d766dcd CF 2 .google.com TRUE.. FALSE 2147483647 GSP ID 353e8f974d766dcd CF 2 .google.com TRUE FALSE 1317124758 PREF ID 353e8f974d766dcd TM 1254052758 LM 1254052758.. LM 1254052758 S _biVh02e4scrJT1H .scholar.google.co.uk TRUE FALSE 2147483647 GSP ID f3f18b3b5a7c2647 CF 2 .google.co.uk..
How can I find out why subprocess.Popen wait() waits forever if stdout=PIPE? http://stackoverflow.com/questions/1445627/how-can-i-find-out-why-subprocess-popen-wait-waits-forever-if-stdout-pipe code looks like from subprocess import p Popen exe shell TRUE stdout PIPE stderr PIPE rtrncode p.wait For a couple of programs..
Creating a JSON response using Django and Python http://stackoverflow.com/questions/2428092/creating-a-json-response-using-django-and-python if validateValue Testuser Validate arrayToJs 2 true RETURN TRUE echo ' jsonValidateReturn '.json_encode arrayToJs .' ' RETURN..
Python subprocess: callback when cmd exits http://stackoverflow.com/questions/2581817/python-subprocess-callback-when-cmd-exits launching a programme using subprocess.Popen cmd shell TRUE I'm fairly new to Python but it 'feels' like there ought to.. lets me do something similar to subprocess.Popen cmd shell TRUE postexec_fn function_to_call_on_exit I am doing this so that..
http://stackoverflow.com/questions/2953462/pinging-servers-in-python is there a way to ping a server through ICMP and return TRUE if the server responds or FALSE if there is no response python..
http://stackoverflow.com/questions/3955077/image-analysis-in-r system.file external rlogo.grd package raster values TRUE plot logo Check out raster # and go to index of the package..
Playing RTSP with python-gstreamer http://stackoverflow.com/questions/4192871/playing-rtsp-with-python-gstreamer error g_main_loop_quit loop break default break return TRUE static void on_pad_added GstElement element GstPad pad gpointer.. location argv 1 NULL g_object_set G_OBJECT source do rtcp TRUE NULL g_object_set G_OBJECT source latency 0 NULL Putting a Message..
http://stackoverflow.com/questions/5199334/clearing-memory-used-by-rpy2 no change in the amount of memory used r.r 'rm list ls all TRUE ' # Same here the objects disappear but the memory is still..
How can one create new scopes in python http://stackoverflow.com/questions/541926/how-can-one-create-new-scopes-in-python a block like this . void foo ... Do some stuff ... if TRUE char a int b ... Do some more stuff ... ... Do even more stuff..
NumPy: calculate averages with NaNs removed http://stackoverflow.com/questions/5480694/numpy-calculate-averages-with-nans-removed nan values from calculation For R people think na.rm TRUE . Here is my non working example import numpy as np dat np.array..
What's making this security descriptor go bad? http://stackoverflow.com/questions/5984483/whats-making-this-security-descriptor-go-bad FILE_ALL_ACCESS import pywintypes import winnt TRUE 1 def CheckAccess path AccessDesired result wintypes.BOOL granted.. token OpenThreadToken GetCurrentThread TOKEN_ALL_ACCESS TRUE mapping wintypes.DWORD MapGenericMask AccessDesired FILE_READ_DATA..
Using a struct as a function argument with the python ctypes module http://stackoverflow.com/questions/8744246/using-a-struct-as-a-function-argument-with-the-python-ctypes-module LPSECURITY_ATTRIBUTES c_void_p NULL 0 FALSE BOOL 0 TRUE BOOL 1 def CreateFile filename access sharemode creation flags.. NULL DWORD 0 byref returnedLength LPOVERLAPPED NULL TRUE #if not result #RemoveDirectory link_name windll.kernel32.CloseHandle..
Why are pandas merges in python faster than data.table merges in R? http://stackoverflow.com/questions/8991709/why-are-pandas-merges-in-python-faster-than-data-table-merges-in-r without resorting to merge X Y all FALSE and merge X Y all TRUE Here's the R code and the Python code used to benchmark the..
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