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lines changed Original file line number Diff line number Diff line change @@ -655,9 +655,6 @@ function.
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Accepts a wide range of Python callables, from plain functions and classes to
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:func: `functools.partial ` objects.
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- If the passed object has a ``__signature__ `` attribute, this function
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- returns it without further computations.
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-
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For objects defined in modules using stringized annotations
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(``from __future__ import annotations ``), :func: `signature ` will
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attempt to automatically un-stringize the annotations using
@@ -692,6 +689,13 @@ function.
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Python. For example, in CPython, some built-in functions defined in
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C provide no metadata about their arguments.
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+ .. impl-detail ::
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+
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+ If the passed object has a :attr: `!__signature__ ` attribute,
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+ we may use it to create the signature.
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+ The exact semantics are an implementation detail and are subject to
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+ unannounced changes. Consult the source code for current semantics.
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+
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.. class :: Signature(parameters=None, *, return_annotation=Signature.empty)
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