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bpo-37806:Fix infinite recursion with typing.get_type_hints. #15493

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bpo-37806:Fix infinite recursion with typing.get_type_hints. #15493

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d09457b
Fix infinite recursion with typing.get_type_hints.
hongweipeng Aug 25, 2019
b727c2a
code review
hongweipeng Aug 26, 2019
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7 changes: 5 additions & 2 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -491,7 +491,7 @@ class ForwardRef(_Final, _root=True):

__slots__ = ('__forward_arg__', '__forward_code__',
'__forward_evaluated__', '__forward_value__',
'__forward_is_argument__')
'__forward_is_argument__', '__hash')

def __init__(self, arg, is_argument=True):
if not isinstance(arg, str):
Expand All @@ -505,6 +505,7 @@ def __init__(self, arg, is_argument=True):
self.__forward_evaluated__ = False
self.__forward_value__ = None
self.__forward_is_argument__ = is_argument
self.__hash = None

def _evaluate(self, globalns, localns):
if not self.__forward_evaluated__ or localns is not globalns:
Expand All @@ -528,7 +529,9 @@ def __eq__(self, other):
self.__forward_value__ == other.__forward_value__)

def __hash__(self):
return hash((self.__forward_arg__, self.__forward_value__))
if self.__hash is None:
self.__hash = hash((self.__forward_arg__, self.__forward_value__))
return self.__hash

def __repr__(self):
return f'ForwardRef({self.__forward_arg__!r})'
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2019-08-26-02-29-14.bpo-37806.wR83qu.rst
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@@ -0,0 +1 @@
Fix infinite recursion from :func:`typing.get_type_hints`. Patch by hongweipeng.