all Python 3inspectfunction

inspect.isfunction()

object kind checks

Checks that an object is a function written in Python (def or lambda), that is types.FunctionType.

Syntax

inspect.isfunction(object) -> bool

This is not 'can I call it': built-ins like len and print, bound methods, functools.partial and classes all give False. A method taken from the class (A.m) is a plain function, while from an instance (a.m) it is already a method that isfunction does not recognize. For 'is it callable' use callable(), for 'a function or method of any origin' use isroutine().

Examples

import functools, inspect
class A:
    def m(self): pass
print(inspect.isfunction(A.m), inspect.isfunction(A().m))  # → True False
print(inspect.isfunction(lambda: 0), inspect.isfunction(len))  # → True False
print(inspect.isfunction(functools.partial(print)), callable(len))  # → False True

See also

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