[New-bugs-announce] [issue36009] weakref.ReferenceType is not a valid typing type

[Alexander Mohr]

New submission from Alexander Mohr <thehesiod at gmail.com>:

For valid types which encapsulate other types, like typing.List or typing.Tuple, you can declare what's contained in them like so:

foo: typing.List[int] = []

Unfortunately weakref.ReferenceType does not allow you to do this.  You get the error:
>>> foo: weakref.ReferenceType[typing.Any] = None
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'type' object is not subscriptable

so either ReferenceType should be fixed or a new type made available.

----------
components: Library (Lib)
messages: 335674
nosy: thehesiod
priority: normal
severity: normal
status: open
title: weakref.ReferenceType is not a valid typing type
type: behavior
versions: Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36009>
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