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bpo-28556: Don't simplify unions at runtime (GH-6841)

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Ivan Levkivskyi 2018-05-18 16:00:38 -07:00 • committed by GitHub
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4 changed files with 21 additions and 45 deletions
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7
Doc/library/typing.rst
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@ -961,16 +961,15 @@ The module defines the following classes, functions and decorators:
Union[int, str] == Union[str, int]
* When a class and its subclass are present, the latter is skipped, e.g.::
Union[int, object] == object
* You cannot subclass or instantiate a union.
* You cannot write ``Union[X][Y]``.
* You can use ``Optional[X]`` as a shorthand for ``Union[X, None]``.
.. versionchanged:: 3.7
Don't remove explicit subclasses from unions at runtime.
.. data:: Optional
Optional type.