New submission from Larry Hastings <la...@hastings.org>:
functools.update_wrapper currently copies over every attribute listed in the
"assigned" parameter, which defaults to WRAPPER_ASSIGNMENTS, which means it
copies the wrapped function's __annotations__ to the wrapper. This is slightly
wrong if the wrapper occludes an annotated parameter:
def foo(a: int, b: str, c: float):
print(a, b, c)
import functools
foo_a = functools.partial(foo, 3)
functools.update_wrapper(foo_a, foo)
print(foo_a.__annotations__)
In this case, foo_a.__annotations__ contains an annotation for a parameter
named "a", even though foo_a doesn't have a parameter named "a".
This problem occurred to me just after I filed #46846; the two issues are
definitely related.
----------
components: Library (Lib)
messages: 413898
nosy: larry, rhettinger
priority: normal
severity: normal
stage: test needed
status: open
title: functools.update_wrapper doesn't understand partial objects and
annotations
type: behavior
versions: Python 3.11
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46847>
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