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bpo-41370: Evaluate strings as forward refs in PEP 585 generics #30900

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Merged
gvanrossum merged 10 commits into from
Mar 7, 2022
Merged

bpo-41370: Evaluate strings as forward refs in PEP 585 generics #30900

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e820e3a
convert strings in PEP 585 generic aliases (`types.GenericAlias`) to …
NiklasRosenstein Jan 25, 2022
d7f57c7
add unittest for new get_type_hints() behaviour on PEP 585 generics w…
NiklasRosenstein Jan 25, 2022
26ab740
add unit test for `from __future__ import annotations`
NiklasRosenstein Jan 27, 2022
a04bd5d
add test for recursive type
NiklasRosenstein Jan 27, 2022
3416713
📜🤖 Added by blurb_it.
blurb-it[bot] Jan 27, 2022
30a3564
Double backticks because RST.
NiklasRosenstein Jan 27, 2022
13a3505
Update Lib/typing.py
NiklasRosenstein Jan 27, 2022
33d286a
Update Misc/NEWS.d/next/Library/2022-01-27-11-54-16.bpo-41370.gYxCPE.rst
NiklasRosenstein Jan 27, 2022
6cd96b1
Merge branch 'main' into issue41370
NiklasRosenstein Feb 22, 2022
39c5b06
Replace assertIs with assertEqual in test_get_type_hints_annotated
NiklasRosenstein Mar 3, 2022
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add unit test for from __future__ import annotations
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@NiklasRosenstein
NiklasRosenstein committed Jan 27, 2022
commit 26ab74013e8274457724eba1a9e83a98a719176d
31 changes: 23 additions & 8 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@
from typing import ParamSpec, Concatenate, ParamSpecArgs, ParamSpecKwargs
from typing import TypeGuard
import abc
import textwrap
import typing
import weakref
import types
Expand Down Expand Up @@ -2009,18 +2010,32 @@ def barfoo2(x: CT): ...
def test_generic_pep585_forward_ref(self):
# See https://bugs.python.org/issue41370

class N:
a: list['N']
class C1:
a: list['C1']
self.assertEqual(
get_type_hints(C1, globals(), locals()),
{'a': list[C1]}
)

class C2:
a: dict['C1', list[List[list['C2']]]]
self.assertEqual(
get_type_hints(N, globals(), locals()),
{'a': list[N]}
get_type_hints(C2, globals(), locals()),
{'a': dict[C1, list[List[list[C2]]]]}
)

class M:
a: dict['N', list[List[list['M']]]]
scope = {}
exec(textwrap.dedent('''
from __future__ import annotations
class C3:
a: List[list["C2"]]
'''), scope)
C3 = scope['C3']

self.assertEqual(C3.__annotations__['a'], "List[list['C2']]")
self.assertEqual(
get_type_hints(M, globals(), locals()),
{'a': dict[N, list[List[list[M]]]]}
get_type_hints(C3, globals(), locals()),
{'a': List[list[C2]]}
)

def test_extended_generic_rules_subclassing(self):
Expand Down