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gh-99535: Add test for inheritance of annotations and update documentation #99990

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merged 6 commits into from
Dec 24, 2022
Merged

gh-99535: Add test for inheritance of annotations and update documentation #99990

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0787052
Add test for inheritance of annotations and update documentation
MonadChains Dec 4, 2022
f5c7cee
Add multiple inheritance case to test
MonadChains Dec 4, 2022
671a262
Add note to get_type_hints
MonadChains Dec 6, 2022
24a118e
Add additional test
MonadChains Dec 7, 2022
67a0175
Rework annotations.rst addition
MonadChains Dec 18, 2022
ad64aab
Improve get_type_hints entry
MonadChains Dec 24, 2022
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4 changes: 4 additions & 0 deletions Doc/howto/annotations.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,10 @@ Accessing The Annotations Dict Of An Object In Python 3.10 And Newer
newer is to call :func:`getattr` with three arguments,
for example ``getattr(o, '__annotations__', None)``.

Starting from Python 3.10, accessing the annotations
of a class will not give anymore the ones of its base
classes.
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Accessing The Annotations Dict Of An Object In Python 3.9 And Older
===================================================================
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21 changes: 21 additions & 0 deletions Lib/test/test_grammar.py
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Expand Up @@ -415,6 +415,27 @@ class Cbad2(C):
x: int
x.y: list = []

def test_annotations_inheritance(self):
# Check that annotations are not inherited by derived classes
class A:
attr: int
class B(A):
pass
class C(A):
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attr: str
class D:
attr2: int
class E(A, D):
pass
class F(C, A):
pass
self.assertEqual(A.__annotations__, {"attr": int})
self.assertEqual(B.__annotations__, {})
self.assertEqual(C.__annotations__, {"attr" : str})
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self.assertEqual(E.__annotations__, {})
self.assertEqual(F.__annotations__, {})


def test_var_annot_metaclass_semantics(self):
class CMeta(type):
@classmethod
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