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Implement @cached_property attribute inference (#292)

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This commit is contained in:
Marti Raudsepp
2020-01-10 12:57:09 +02:00
committed by Maksim Kurnikov
parent 7ba578f6b2
commit 6f296b0a91
3 changed files with 29 additions and 6 deletions
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18
test-data/typecheck/utils/test_functional.yml Normal file
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@@ -0,0 +1,18 @@
- case: cached_property_class_vs_instance_attributes
main: |
from django.utils.functional import cached_property
from typing import List
class Foo:
@cached_property
def attr(self) -> List[str]: ...
reveal_type(attr) # N: Revealed type is 'django.utils.functional.cached_property[builtins.list*[builtins.str]]'
reveal_type(attr.name) # N: Revealed type is 'builtins.str'
reveal_type(Foo.attr) # N: Revealed type is 'django.utils.functional.cached_property[builtins.list*[builtins.str]]'
reveal_type(Foo.attr.func) # N: Revealed type is 'def (*Any, **Any) -> builtins.list*[builtins.str]'
f = Foo()
reveal_type(f.attr) # N: Revealed type is 'builtins.list*[builtins.str]'
f.attr.name # E: "List[str]" has no attribute "name"