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[3.12] gh-113255: Clarify docs for typing.reveal_type (GH-113286) (#113323)

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gh-113255: Clarify docs for `typing.reveal_type` (GH-113286)
(cherry picked from commit 11ee912327)

Co-authored-by: Kir <note351@hotmail.com>
Co-authored-by: AlexWaygood <alex.waygood@gmail.com>
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Miss Islington (bot) 2023-12-20 18:36:45 +01:00 • committed by GitHub
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2 changed files with 15 additions and 16 deletions
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Lib/typing.py
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@ -3280,7 +3280,7 @@ sys.modules[re.__name__] = re
def reveal_type[T](obj: T, /) -> T:
"""Reveal the inferred type of a variable.
"""Ask a static type checker to reveal the inferred type of an expression.
When a static type checker encounters a call to ``reveal_type()``,
it will emit the inferred type of the argument::
@ -3292,7 +3292,7 @@ def reveal_type[T](obj: T, /) -> T:
will produce output similar to 'Revealed type is "builtins.int"'.
At runtime, the function prints the runtime type of the
argument and returns it unchanged.
argument and returns the argument unchanged.
"""
print(f"Runtime type is {type(obj).__name__!r}", file=sys.stderr)
return obj