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python Programming Glossary: let'sWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python directly and we don't override call the parent __new__ . Let's do it class UpperAttrMetaclass type def __new__ upperattr_metaclass..
http://stackoverflow.com/questions/1396668/python-get-object-by-id Get object by id Let's say I have an id of a Python object which I retrieved by doing..
What's the canonical way to check for type in python? http://stackoverflow.com/questions/152580/whats-the-canonical-way-to-check-for-type-in-python checking whether the object inherits from a given type Let's say I have an object o . How do I check whether it's a str ..
Circular import dependency in Python http://stackoverflow.com/questions/1556387/circular-import-dependency-in-python import dependency in Python Let's say I have the following directory structure a __init__.py b..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained another list Then just import itertools . An example Let's see the possible orders of arrival for a 4 horse race horses..
Why does Python print unicode characters when the default encoding is ASCII? http://stackoverflow.com/questions/2596714/why-does-python-print-unicode-characters-when-the-default-encoding-is-ascii setting python import sys print sys.stdout.encoding UTF 8 Let's for a moment exit the Python shell and set bash's environment.. encoding independantly from the shell's environment. Let's then start Python from the shell and verify that sys.stdout.encoding.. Just like case 1 it yields é and that's what's displayed. Let's now change the terminal's encoding settings to UTF 8 from the..
How do I randomly select an item from a list using Python? http://stackoverflow.com/questions/306400/how-do-i-randomly-select-an-item-from-a-list-using-python do I randomly select an item from a list using Python Let's say as an example I have the following list foo 'a' 'b' 'c'..
Why use pip over easy_install? http://stackoverflow.com/questions/3220404/why-use-pip-over-easy-install above tweet seem to strongly favor pip over easy_install Let's assume that we're talking about easy_install from the Distribute..
Weighted random selection with and without replacement http://stackoverflow.com/questions/352670/weighted-random-selection-with-and-without-replacement and thus can represent the split with a single percentage. Let's us take the example of five equally weighted choices a 1 b 1..
How to find the mime type of a file in python? http://stackoverflow.com/questions/43580/how-to-find-the-mime-type-of-a-file-in-python to find the mime type of a file in python Let's say you want to save a bunch of files somewhere for instance.. to save a bunch of files somewhere for instance in BLOBs. Let's say you want to dish these files out via a web page and have..
Comprehension for flattening a sequence of sequences? http://stackoverflow.com/questions/457215/comprehension-for-flattening-a-sequence-of-sequences figure out how to do it. Here's a very construed case Let's say I want to swap the elements of every pair in a sequence...
Editing specific line in text file in python http://stackoverflow.com/questions/4719438/editing-specific-line-in-text-file-in-python question but I looked at python's IO and my last question. Let's say I have a text file containing Dan Warrior 500 1 0 is there..
Using strides for an efficient moving average filter http://stackoverflow.com/questions/4936620/using-strides-for-an-efficient-moving-average-filter orders of magnitude larger than your original array i.e. Let's say that you're working with a 100x100 original array... The..
http://stackoverflow.com/questions/5957341/python-list-confusion list confusion Let's say I have the following code a_list 0 10 10 This generates..
What is the best way to implement nested dictionaries in Python? http://stackoverflow.com/questions/635483/what-is-the-best-way-to-implement-nested-dictionaries-in-python which essentially amounts to a nested dictionary. Let's say it looks like this 'new jersey' 'mercer county' 'plumbers'..
Python: How do I pass a variable by reference? http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference even mutate the object. Okay this is a little confusing. Let's have some examples. List a mutable type Let's try to modify.. confusing. Let's have some examples. List a mutable type Let's try to modify the list that was passed to a method def try_to_change_list_contents.. I can do to pass the variable by actual reference . Let's work on that. How do we get around this As @Andrea's answer..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python Python I've mastered almost all the Python concepts well let's say they're just OO concepts but this one is tricky. I know.. Foo 'BAR' # Out True f Foo print f.BAR # Out 'bip' Now let's do exactly the same but using a real class for a metaclass #..
Source interface with Python and urllib2 http://stackoverflow.com/questions/1150332/source-interface-with-python-and-urllib2 that code. Neither is GOOD but both can work so at least let's be thankful that we have such options by using an open source..
Python @classmethod and @staticmethod for beginner? http://stackoverflow.com/questions/12179271/python-classmethod-and-staticmethod-for-beginner about certain dates without timezone information let's assume all dates are presented in UTC . Here we have __init__..
Python: How to make a cross-module variable? http://stackoverflow.com/questions/142545/python-how-to-make-a-cross-module-variable that works the same way how would I do it The variable let's be original and call it 'foo' doesn't have to be truly global..
Why can't Python handle true/false values as I expect? http://stackoverflow.com/questions/2055029/why-cant-python-handle-true-false-values-as-i-expect they don't have any names yet but to know what we refer to let's call them 0x600D and 0xBAD . Before starting to execute a Python..
Django - Iterate over model instance field names and values in template http://stackoverflow.com/questions/2170228/django-iterate-over-model-instance-field-names-and-values-in-template the value of that field in the second column. For example let's say we have the following model definition class Client Model..
http://stackoverflow.com/questions/228181/the-zen-of-python may be a good idea. Namespaces are one honking great idea let's do more of those Can I have an example of each of those items..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained generator Controlling a generator exhaustion class Bank # let's create a bank building ATMs ... crisis False ... def create_atm..
Solving embarassingly parallel problems using Python multiprocessing http://stackoverflow.com/questions/2359253/solving-embarassingly-parallel-problems-using-python-multiprocessing programming but I am still lost in trying to solve it so let's write a canonical example to illustrate how this is done using..
Turn a string into a valid filename in Python http://stackoverflow.com/questions/295135/turn-a-string-into-a-valid-filename-in-python using Python. I'd rather be strict than otherwise so let's say I want to retain only letters digits and a small set of..
Calling a function from a string with the function's name in Python http://stackoverflow.com/questions/3061/calling-a-function-from-a-string-with-the-functions-name-in-python with the function's name in a Python program. For example let's say that I have a module foo and I have a string whose contents..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do be set to the module's name. In the case of your script let's assume that it's executing as the main function e.g. you said..
Open document with default application in Python http://stackoverflow.com/questions/434597/open-document-with-default-application-in-python Okay clearly this silly ass controversy continues so let's just look at doing this with subprocess. open and start are.. things for Mac OS X and Windows repsectively. Now let's say we use subprocess. Canonically you'd use try retcode subprocess.call..
In Python, how do I get the path and name of the file that is currently executing? http://stackoverflow.com/questions/50499/in-python-how-do-i-get-the-path-and-name-of-the-file-that-is-currently-executin that is currently running within the process. For example let's say I have three files. Using execfile script_1.py calls script_2.py...
Windows cmd encoding change causes Python crash http://stackoverflow.com/questions/878972/windows-cmd-encoding-change-causes-python-crash fixing up sys.stdout and sys.stderr e # While we're at it let's unmangle the command line arguments # This works around http..
http://stackoverflow.com/questions/972362/spawning-process-from-python # standard input 0 os.dup2 0 1 os.dup2 0 2 # and finally let's execute the executable for the daemon try os.execv path_to_executable..
Python: How do I pass a variable by reference? http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference it and have the changes reflected in the outer scope. Now let's see what happens when we try to change the reference that was.. nothing we can do to change the contents of the string Now let's try to change the reference def try_to_change_string_reference..
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