How to overload predefined operators

The following table has a list of methods(operators) we can overload.

Method	Overloads	Called for
__init__	Constructor	Object creation: X = Class( )
__del__	Destructor	Object reclamation
__add__	Operator +	X + Y, X += Y
__or__	Operator \| (bitwise OR)	X \| Y, X \|= Y
__repr__,__str__	Printing, conversions	print X, repr(X), str(X)
__call__	Function calls	X( )
__getattr__	Qualification	X.undefined
__setattr__	Attribute assignment	X.any = value
__getitem__	Indexing	X[key], for loops and other iterations if no _ _iter_ _
__setitem__	Index assignment	X[key] = value
__len__	Length	len(X), truth tests
__cmp__	Comparison	X == Y, X < Y
__lt__	Specific comparison	X < Y (or else __cmp__)
__eq__	Specific comparison	X == Y (or else __cmp__)
__radd__	Right-side operator +	Noninstance + X
__iadd__	In-place addition	X += Y (or else __add__)
__iter__	Iteration contexts	for loops, in tests, list comprehensions, map, others