New submission from Gareth Rees:
The type objects constructed by the metaclasses in the typing module are
hashable and comparable for equality:
>>> from typing import *
>>> {Mapping[str, int], Mapping[int, str]}
{typing.Mapping[int, str], typing.Mapping[str, int]}
>>> Union[str, int, float] == Union[float, int, str]
True
>>> List[int] == List[float]
False
but this is not clearly documented in the documentation for the typing module
(there are a handful of examples using equality, but it's not explicit that
these are runnable).
It would be nice if there were explicit documentation for these properties of
type objects.
----------
assignee: docs@python
components: Documentation
messages: 270981
nosy: Gareth.Rees, docs@python
priority: normal
severity: normal
status: open
title: Type objects are hashable and comparable for equality but this is not
documented
type: enhancement
versions: Python 3.5, Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27588>
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