2.3.9.3 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.
The implementation adds two special read-only attributes: f.func_code
is a function's code object
(see below) and f.func_globals is the dictionary used as the
function's global namespace (this is the same as m.__dict__ where m
is the module in which the function f was defined).
Function objects also support getting and setting arbitrary attributes, which can be
used, for example, to attach metadata to functions. Regular attribute dot-notation is used
to get and set such attributes. Note that the current implementation only supports
function attributes on user-defined functions. Function attributes on built-in functions
may be supported in the future.
Functions have another special attribute f.__dict__ (a.k.a. f.func_dict)
which contains the namespace used to support function attributes. __dict__
and func_dict can be accessed directly or set to a dictionary object. A
function's dictionary cannot be deleted.
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