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Add PEP 613 TypeAlias stub to typing_extensions #4243

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Merged
merged 2 commits into from
Jun 19, 2020

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east825
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@east825 east825 commented Jun 19, 2020

At the moment this special marker annotation described in
PEP 613 exists only in typing_extensions module
(see python/typing#732).

At the moment this special marker annotation described in
PEP 613 exists only in typing_extensions module
(see python/typing#732).
@east825
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east825 commented Jun 19, 2020

BTW, what's the difference between declarations such as

Any = object()
TypedDict: object

(in typing.pyi)

and

TypedDict: object = ...

(in typing_extensions.pyi)

These are considered equivalent, aren't they? Which one is preferred then?

@srittau
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srittau commented Jun 19, 2020

Foo: object is the preferred form. The = ... is redundant. Any = object() doesn't make much sense in stubs. The reason that type checkers don't complain is that typing.pyi is usually special-cased by them.

@east825
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east825 commented Jun 19, 2020

Ok, thanks! I'll drop "= ..." part in my PR then.

@srittau srittau merged commit 30bbf02 into python:master Jun 19, 2020
vishalkuo pushed a commit to vishalkuo/typeshed that referenced this pull request Jun 26, 2020
@east825 east825 deleted the PEP-613_typing_extensions.TypeAlias branch October 7, 2020 19:54
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2 participants