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python Programming Glossary: exampleWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python So what are metaclasses What do you use them for Concrete examples including snippets much appreciated python oop metaclass python.. classes matching the current context. Imagine a stupid example where you decide that all classes in your module should have.. but it's helpful . So we will start with a simple example by using a function. # the metaclass will automatically get..
Flatten (an irregular) list of lists in Python http://stackoverflow.com/questions/2158395/flatten-an-irregular-list-of-lists-in-python this question Using generator functions can make your example a little easier to read and probably boost the performance...
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained the use of the yield keyword in Python What does it do For example I'm trying to understand this code def node._get_child_candidates.. for i in mygenerator ... print i 0 1 4 Here it's a useless example but it's handy when you know your function will return a huge.. creating another list Then just import itertools . An example Let's see the possible orders of arrival for a 4 horse race..
Is there any way to kill a Thread in Python? http://stackoverflow.com/questions/323972/is-there-any-way-to-kill-a-thread-in-python regular interval to see if it is time for him to exit. For example import threading import ctypes class StoppableThread threading.Thread.. cases however when you really need to kill a thread for example when you are wrapping an external library that is busy for long..
How can I represent an 'Enum' in Python? http://stackoverflow.com/questions/36932/how-can-i-represent-an-enum-in-python if the reverse mapping doesn't exist. With the first example Numbers.reverse_mapping 'three' 'THREE' share improve this..
Ternary conditional operator in Python http://stackoverflow.com/questions/394809/ternary-conditional-operator-in-python evaluates to True a is returned else b is returned. For example 'true' if True else 'false' 'true' 'true' if False else 'false'..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do ` do What does the if __name__ __main__ do # Threading example import time thread def myfunction string sleeptime lock args.. Thread # 2 2 lock Also what does args mean in this example python idioms python import share improve this question .. the code it will define a few special variables. For example if the python interpreter is running that module the source..
How to improve performance of this code? http://stackoverflow.com/questions/4295799/how-to-improve-performance-of-this-code not sure because this is my first program in python . The example run in the bottom of the code takes a long time to be solved.. trick and it performed in 0.2 sec for your first example and 2.1 sec for your second but I haven't tried verifying the..
What is the most “pythonic” way to iterate over a list in chunks? http://stackoverflow.com/questions/434287/what-is-the-most-pythonic-way-to-iterate-over-a-list-in-chunks it this way for i in xrange 0 len ints 4 # dummy op for example code foo ints i ints i 1 ints i 2 ints i 3 It looks a lot like.. args fillvalue fillvalue Example In pesudocode to keep the example terse. grouper 'ABCDEFG' 3 'x' 'ABC' 'DEF' 'Gxx' Note izip_longest..
http://stackoverflow.com/questions/509211/pythons-slice-notation programmer if there are fewer items than you ask for. For example if you ask for a 2 and a only contains one element you get an..
What is a “callable” in Python? http://stackoverflow.com/questions/111234/what-is-a-callable-in-python Called when the instance is ''called'' as a function Example class Foo def __call__ self print 'called' foo_instance Foo..
The meaning of a single- and a double-underscore before an object name in Python http://stackoverflow.com/questions/1301346/the-meaning-of-a-single-and-a-double-underscore-before-an-object-name-in-python to access or modify a variable that is considered private. Example class MyClass ... def __init__ self ... self.__superprivate..
http://stackoverflow.com/questions/145607/text-difference-algorithm class which can be used to give you a similarity ratio. Example function def text_compare text1 text2 isjunk None return difflib.SequenceMatcher..
http://stackoverflow.com/questions/1720421/merge-two-lists-in-python two lists in Python How do I merge two lists in Python Example listone 1 2 3 listtwo 4 5 6 Outcome we expect mergedlist 1 2..
How can I quantify difference between two images? http://stackoverflow.com/questions/189943/how-can-i-quantify-difference-between-two-images is off the latter will tell only how many pixels differ. Example I assume your images are well aligned the same size and shape..
Which programming languages can I use on Android Dalvik? http://stackoverflow.com/questions/1994703/which-programming-languages-can-i-use-on-android-dalvik BeanShell . For having idea and usage of ASE refer this Example link . Scala is also supported. For having examples of Scala.. also supported. For having examples of Scala refer these Example link 1 Example link 2 Example link 3 . Just now i have referred.. For having examples of Scala refer these Example link 1 Example link 2 Example link 3 . Just now i have referred one Article..
Generate a heatmap in MatPlotLib using a scatter data set http://stackoverflow.com/questions/2369492/generate-a-heatmap-in-matplotlib-using-a-scatter-data-set
How to clone a list in python? http://stackoverflow.com/questions/2612802/how-to-clone-a-list-in-python and most memory needing method but sometimes unavoidable. Example import copy class Foo object def __init__ self val self.val..
Getting key with maximum value in dictionary? http://stackoverflow.com/questions/268272/getting-key-with-maximum-value-in-dictionary I have a dictionary keys are strings values are integers. Example stats 'a' 1000 'b' 3000 'c' 100 I'd like to get 'b' as an answer..
Python: Once and for all. What does the Star operator mean in Python? [duplicate] http://stackoverflow.com/questions/2921847/python-once-and-for-all-what-does-the-star-operator-mean-in-python that aren't specifically named in the declaration. Example def sum values s 0 for v in values s s v return s s sum 1 2..
How to stream an HttpResponse with Django http://stackoverflow.com/questions/2922874/how-to-stream-an-httpresponse-with-django of whitespace down the pipe to force its buffers to fill. Example follows from django.views.decorators.http import condition @condition..
What is the most “pythonic” way to iterate over a list in chunks? http://stackoverflow.com/questions/434287/what-is-the-most-pythonic-way-to-iterate-over-a-list-in-chunks iterable n return izip_longest args fillvalue fillvalue Example In pesudocode to keep the example terse. grouper 'ABCDEFG' 3..
How to install pip on windows? http://stackoverflow.com/questions/4750806/how-to-install-pip-on-windows Python applications and other free software respect these. Example syntax http proxy_url port http username password@proxy_url..
Rolling or sliding window iterator in Python http://stackoverflow.com/questions/6822725/rolling-or-sliding-window-iterator-in-python __main__ for w in rolling_window xrange 6 3 print w Example output 0 1 2 1 2 3 2 3 4 3 4 5 python share improve this..
Use numpy array in shared memory for multiprocessing http://stackoverflow.com/questions/7894791/use-numpy-array-in-shared-memory-for-multiprocessing shared_arr.get_obj # no data copying arr i arr i Example import ctypes import logging import multiprocessing as mp from..
Converting datetime.date to UTC timestamp in Python http://stackoverflow.com/questions/8777753/converting-datetime-date-to-utc-timestamp-in-python 24 3600 10 6 10 6 computed with true division enabled. Example from datetime import datetime timedelta def totimestamp dt epoch..
http://stackoverflow.com/questions/890128/python-lambda-why you can pass functions to other functions to do stuff. Example mult3 filter lambda x x 3 0 1 2 3 4 5 6 7 8 9 sets mult3 to..
How to learn Python: Good Example Code? [closed] http://stackoverflow.com/questions/918/how-to-learn-python-good-example-code to learn Python Good Example Code closed I have been dabbling in Python for a couple months..
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