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python 3.7 RecursionError when using recursive typing definition and get_type_hints #574

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python 3.7 RecursionError when using recursive typing definition and get_type_hints#574

Description

@reinhrst
reinhrst
opened on Jul 25, 2018

The following code gives a RecursionError in python 3.7.0 (runs fine in 3.6.4, giving the answer {'return': typing.Sequence[typing.Union[str, typing.Sequence[typing.Union[str, _ForwardRef('Foo')]]]]})

import typing

Foo = typing.Sequence[typing.Union[str, "Foo"]]

def a() -> Foo:
   ...

typing.get_type_hints(a)

Activity

  1. reinhrst
    changed the title [-]python 3.7 max recursion when using recursive typing definition and get_type_hints[/-] [+]python 3.7 RecursionError when using recursive typing definition and get_type_hints[/+] on Jul 25, 2018

  2. ilevkivskyi commented on Aug 1, 2018

    @ilevkivskyi
    ilevkivskyi
    on Aug 1, 2018
    Member

    Thanks for reporting! I think this may be related to recent fixes to interaction between get_type_hints and from __future__ import annotations. The fix for this regression may be non-trivial, so I would prefer to wait for @ambv opinion here.

  3. ilevkivskyi
    added
    bug
    on Aug 1, 2018
  4. basnijholt
    added 5 commits that reference this issue on Oct 13, 2021

    make sure that fix for python/typing#574 still works

    9562121

    make sure that fix for python/typing#574 still works

    a07798f

    make sure that fix for python/typing#574 still works

    91bfbcf

    make sure that fix for python/typing#574 still works

    9e4ddf1

    make sure that fix for python/typing#574 still works

    139b5b9

  5. srittau commented on Nov 4, 2021

    @srittau
    srittau
    on Nov 4, 2021
    Collaborator

    As the typing module is not part of Python, please file a bug report at bugs.python.org if this is still an issue.

  6. srittau
    closed this as completedon Nov 4, 2021
  7. gaborbernat
    added a commit that references this issue on Dec 31, 2021

    make sure that fix for python/typing#574 still works

    fdf8351
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