3.11.3 Functions
Function objects are created by function definitions. The only
operation on a function object is to call it:
func(argument-list).
There are really two flavors of function objects: built-in functions and user-defined functions. Both support the same operation (to call the function), but the implementation is different, hence the different object types.
See the Python Reference Manual for more information.
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Release 2.5, documentation updated on 19th September, 2006.