mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 08:59:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 11

bpo-45121: Fix RecursionError when calling Protocol.__init__ from a subclass' __init__ (GH-28206)

Browse source
This commit is contained in:
Yurii Karabas 2021-09-08 13:25:09 +03:00 • committed by GitHub
parent d003a5bd25
commit c11956a8bd
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 17 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

5
Lib/typing.py
View file

@ -1406,6 +1406,11 @@ def _no_init_or_replace_init(self, *args, **kwargs):
if cls._is_protocol:
raise TypeError('Protocols cannot be instantiated')
# Already using a custom `__init__`. No need to calculate correct
# `__init__` to call. This can lead to RecursionError. See bpo-45121.
if cls.__init__ is not _no_init_or_replace_init:
return
# Initially, `__init__` of a protocol subclass is set to `_no_init_or_replace_init`.
# The first instantiation of the subclass will call `_no_init_or_replace_init` which
# searches for a proper new `__init__` in the MRO. The new `__init__`