Python2012-04-07
goto in Python
You can use exceptions to provide a 'structured goto' that even works across function calls. Many feel that exceptions can conveniently emulate all reasonable uses of the 'go' or '
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Python2012-04-07
Garbage Collection in Python
The details of Python memory management depend on the implementation. The standard C implementation of Python uses reference counting to detect inaccessible objects, and another me
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switch case statement in Python
There is no switch or case statement in Python. Because, you can do this easily enough with a sequence of if... elif... elif... else. There have been some proposals for switch stat
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Overloading in python
This answer on how to overload in python actually applies to all methods, but the question usually comes up first in the context of constructors.
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Static in python
Both static data and static methods (in the sense of C++ or Java) are supported in Python. For static data, simply define a class attribute. To assign a new value to the attribute,
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Delegation in python
Delegation is an object oriented technique (also called a design pattern). Let's say you have an object x and want to change the behaviour of just one of its methods. You can creat
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Python2012-04-07
Schwartzian Transform in python
The technique, attributed to Randal Schwartz of the Perl community, sorts the elements of a list by a metric which maps each element to its "sort value". In Python, just use the ke
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Multidimensional list (array) in python
The reason is that replicating a list with * doesn't create copies, it only creates references to the existing objects. The *3 creates a list containing 3 references to the same li
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Array in python
Lists are equivalent to C or Pascal arrays in their time complexity; the primary difference is that a Python list can contain objects of many different types.
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Remove duplicates from a list in python
If you don't mind reordering the list, sort it and then scan from the end of the list, deleting duplicates as you go
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Iterate over a sequence in reverse order in python
Use the reversed() built-in function, which is new in Python 2.4
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Convert between tuples and lists in python
The type constructor tuple(seq) converts any sequence (actually, any iterable) into a tuple with the same items in the same order.
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