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functools.update_wrapper

functools

Copy metadata (__name__, __doc__, …) from a wrapped function onto the wrapper.

Syntax

functools.update_wrapper(wrapper, wrapped)

You rarely reach for it directly, since @functools.wraps is just this function packaged as a decorator. Call it by hand when the wrapper is not a plain def inside a decorator — a functools.partial object, say, or an instance of a class with __call__. It mutates the wrapper in place (returning it too) and stores a __wrapped__ back-reference, which is what lets inspect.signature report the original parameters instead of (*args, **kwargs).

Examples

import functools
def orig():
    'док'
def wrap():
    pass
functools.update_wrapper(wrap, orig)
print(wrap.__name__)   # → orig

functools.update_wrapper

Syntax

Examples

See also