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Add Void type #24557

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Add Void type #24557

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18 changes: 18 additions & 0 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -402,6 +402,24 @@ def stop() -> NoReturn:
"""
raise TypeError(f"{self} is not subscriptable")

@_SpecialForm
def Void(self, parameters):
"""Special type indicating functions that do not return values.
Example::

from typing import Void, Any

def nothing() -> Void:
pass

nothing() #passes type checking
a: Any = nothing() #fails type checking

This type is invalid in any context other than a function/method return
type annotation, e.g., ``List[Void]`` will fail in static type checkers.
"""
raise TypeError(f"{self} is not subscriptable")

@_SpecialForm
def ClassVar(self, parameters):
"""Special type construct to mark class variables.
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