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python Programming Glossary: whenWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python a class on the fly dynamically. This is what Python does when you use the keyword class and it does so by using a metaclass... attribute You can add a __metaclass__ attribute when you write a class class Foo object __metaclass__ something..... of a metaclass is to change the class automatically when it's created. You usually do this for APIs where you want to..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained distance min_dist max_dist return result What happens when the method _get_child_candidates is called A list is returned.. all the values in memory and it's not always what you want when you have a lot of values. Generators Generators are iterators.. print i 0 1 4 Here it's a useless example but it's handy when you know your function will return a huge set of values that..
http://stackoverflow.com/questions/2709821/python-self-explained is the convention and people will generally frown at you when you use something else. self is not special to the code it's..
Python “is” operator behaves unexpectedly with integers http://stackoverflow.com/questions/306313/python-is-operator-behaves-unexpectedly-with-integers of integer objects for all integers between 5 and 256 when you create an int in that range you actually just get back a..
How do you split a list into evenly sized chunks in Python? http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks-in-python ways to do this like keeping a counter and two lists and when the second list fills up add it to the first list and empty..
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 In this code you should call stop on the thread when you want it to exit and wait for the thread to exit properly.. the stop flag at regular intervals. They are cases however when you really need to kill a thread for example when you are wrapping.. however when you really need to kill a thread for example when you are wrapping an external library that is busy for long calls..
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python because you throw away the temporary lists you create when you extend the original with the temporary. Edit As J.F. Sebastian..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do doing the main check you can have that code only execute when you want to run the module as a program and not have it execute.. to run the module as a program and not have it execute when someone just wants to import your module and call your functions..
Making a flat list out of list of lists in Python [duplicate] http://stackoverflow.com/questions/952914/making-a-flat-list-out-of-list-of-lists-in-python on including the implied use in sum are of necessity O L 2 when there are L sublists as the intermediate result list keeps getting..
Python: How do I pass a variable by reference? http://stackoverflow.com/questions/986006/python-how-do-i-pass-a-variable-by-reference reflected in the outer scope. Now let's see what happens when we try to change the reference that was passed in as a parameter..
What is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python classes are objects they must be generated by something. When you use the class keyword Python creates this object automatically... use type to create the class. Read that several times. When you do class Foo Bar pass Python does the following Is there.. There are several reasons to do so The intention is clear. When you read UpperAttrMetaclass type you know what's going to follow..
Difference between __str__ and __repr__ in Python http://stackoverflow.com/questions/1436703/difference-between-str-and-repr-in-python having the str of it look like 192.168.1.1 is just fine. When implementing a date time abstraction the str can be 010 4 12..
http://stackoverflow.com/questions/15112125/if-x-or-y-or-z-blah a fixed amount of time whatever the left hand operand is . When you use or python sees each side of the operator as separate..
Python: Difference between class and instance attributes http://stackoverflow.com/questions/207000/python-difference-between-class-and-instance-attributes in performance or space requirements for the two styles When you read the code do you consider the meaning of the two styles..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained returned A single element is returned Is it called again When subsequent calls do stop The code comes from Jochen Schulz jrschulz.. are. And before generators come iterables. Iterables When you create a list you can read its items one by one and it's.. 3 for i in mylist ... print i 1 2 3 Mylist is an iterable. When you use a list comprehension you create a list and so an iterable..
Unexpected feature in a Python list of lists http://stackoverflow.com/questions/240178/unexpected-feature-in-a-python-list-of-lists it python list mutable share improve this question When you write x 3 you get essentially the list x x x . That is a.. the list x x x . That is a list with 3 references to x . When you then change x all three references are changed. To fix it..
In a django form, How to make a field readonly (or disabled) so that it cannot be edited? http://stackoverflow.com/questions/324477/in-a-django-form-how-to-make-a-field-readonly-or-disabled-so-that-it-cannot-b a django form how do I make a field read only or disabled When the form is being used to create a new entry all fields should..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do this question Expanding a bit on Harley's answer... When the Python interpreter reads a source file it executes all of..
Generator Expressions vs. List Comprehension http://stackoverflow.com/questions/47789/generator-expressions-vs-list-comprehension Expressions vs. List Comprehension When should you use generator expressions vs. list comprehensions..
Python, Unicode, and the Windows console http://stackoverflow.com/questions/5419/python-unicode-and-the-windows-console Unicode and the Windows console When I try to print a Unicode string in a Windows console I get a..
Python __init__ and self what do they do? http://stackoverflow.com/questions/625083/python-init-and-self-what-do-they-do object Python does not. You have to declare it explicitly. When you create an instance of the A class and call its methods it.. method is roughly what represents a constructor in Python. When you call A Python creates an object for you and passes it as..
Recommendations of Python REST (web services) framework? [closed] http://stackoverflow.com/questions/713847/recommendations-of-python-rest-web-services-framework frameworks that get it right are web.py Flask and Bottle . When combined with the mimerender library full disclosure I wrote..
Strip HTML from strings in Python http://stackoverflow.com/questions/753052/strip-html-from-strings-in-python html br.response .readlines for line in html print line When printing a line in an HTML file I'm trying to find a way to..
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