Python 3.11+inspectfunction

inspect.ismethodwrapper()

descriptors

Checks that an object is a method-wrapper: a special method of a built-in type already bound to an instance, like (1).__add__.

Syntax

inspect.ismethodwrapper(object) -> bool

Tell the pair apart: int.__add__ is a descriptor (wrapper_descriptor), while (1).__add__ is a method-wrapper bound to the number. ismethod is False for it and so is isbuiltin, so code hunting for 'methods' via ismethod misses these objects. They show up on your own objects too: obj.__str__ inherited from object is also a method-wrapper.

Examples

import inspect
class A: pass
print(inspect.ismethodwrapper((1).__add__))  # → True
print(inspect.ismethodwrapper(int.__add__))  # → False — это дескриптор
print(inspect.ismethodwrapper(A().__str__), inspect.ismethod(A().__str__))  # → True False

See also

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