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Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
745 B
745 B
Generic builtins
Variadic keyword arguments with a custom dict
When we define dict in a custom typeshed, we must take care to define it as a generic class in the
same way as in the real typeshed.
[environment]
typeshed = "/typeshed"
/typeshed/stdlib/builtins.pyi:
class object: ...
class int: ...
class dict[K, V, Extra]: ...
/typeshed/stdlib/typing_extensions.pyi:
def reveal_type(obj, /): ...
If we don't, then we may get "surprising" results when inferring the types of variadic keyword arguments.
def f(**kwargs):
reveal_type(kwargs) # revealed: dict[Unknown, Unknown, Unknown]
def g(**kwargs: int):
reveal_type(kwargs) # revealed: dict[Unknown, Unknown, Unknown]