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bpo-46539: Pass status of special typeforms to forward references by GBeauregard · Pull Request #30926 · python/cpython · GitHub

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bpo-46539: Pass status of special typeforms to forward references #30926

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Merged
gvanrossum merged 6 commits into from
Jan 27, 2022
Conversation 15 Commits 6 Checks 0 Files changed
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bpo-46539: Pass status of special typeforms to forward references #30926

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1a31030
Pass status of special forms to forward references
GBeauregard Jan 26, 2022
1b4c262
📜🤖 Added by blurb_it.
blurb-it[bot] Jan 26, 2022
535a124
restore ForwardRef public api arg name
GBeauregard Jan 26, 2022
32deeb8
update NEWS and change dunder method back
GBeauregard Jan 27, 2022
41aafb4
add more tests to further cover behavior
GBeauregard Jan 27, 2022
8c148e2
use double backticks for RST
GBeauregard Jan 27, 2022
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update NEWS and change dunder method back
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GBeauregard committed Jan 27, 2022
commit 32deeb8c2983311dc010b25ea95133c7891bd222
6 changes: 3 additions & 3 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -661,7 +661,7 @@ class ForwardRef(_Final, _root=True):

__slots__ = ('__forward_arg__', '__forward_code__',
'__forward_evaluated__', '__forward_value__',
'__forward_is_argument__', '__forward_allow_special_forms__',
'__forward_is_argument__', '__forward_is_class__',
'__forward_module__')

def __init__(self, arg, is_argument=True, module=None, *, is_class=False):
Expand All @@ -676,7 +676,7 @@ def __init__(self, arg, is_argument=True, module=None, *, is_class=False):
self.__forward_evaluated__ = False
self.__forward_value__ = None
self.__forward_is_argument__ = is_argument
self.__forward_allow_special_forms__ = is_class
self.__forward_is_class__ = is_class
self.__forward_module__ = module

def _evaluate(self, globalns, localns, recursive_guard):
Expand All @@ -697,7 +697,7 @@ def _evaluate(self, globalns, localns, recursive_guard):
eval(self.__forward_code__, globalns, localns),
"Forward references must evaluate to types.",
is_argument=self.__forward_is_argument__,
allow_special_forms=self.__forward_allow_special_forms__,
allow_special_forms=self.__forward_is_class__,
)
self.__forward_value__ = _eval_type(
type_, globalns, localns, recursive_guard | {self.__forward_arg__}
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2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Library/2022-01-26-20-36-30.bpo-46539.23iW1d.rst
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Original file line number Diff line number Diff line change
@@ -1 +1 @@
typing: Pass on status of special forms to forward references. Patch by Gregory Beauregard.
In :func:`typing.get_type_hints`, support evaluating stringified `ClassVar` and `Final` annotations inside `Annotated`. Patch by Gregory Beauregard.
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