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[3.11] gh-103921: Improve typing documentation (GH-104642) (#105007)

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Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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Jelle Zijlstra 2023-05-27 16:30:41 -07:00 • committed by GitHub
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8
Lib/typing.py
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@ -1177,17 +1177,9 @@ def add_two(x: float, y: float) -> float:
'''Add two numbers together.'''
return x + y
Parameter specification variables defined with covariant=True or
contravariant=True can be used to declare covariant or contravariant
generic types. These keyword arguments are valid, but their actual semantics
are yet to be decided. See PEP 612 for details.
Parameter specification variables can be introspected. e.g.:
P.__name__ == 'P'
P.__bound__ == None
P.__covariant__ == False
P.__contravariant__ == False
Note that only parameter specification variables defined in global scope can
be pickled.