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Provide hint when Union type with None may not have been narrowed #17178

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angelawuuu wants to merge 14 commits into from
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Provide hint when Union type with None may not have been narrowed #17178

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80f9788
added new circumstance of having NONE as the second object of a union…
Apr 23, 2024
0c28fad
added new circumstance of having NONE as the second object of a union…
Apr 23, 2024
30493ba
Add back new circumstance of having NONE as the second object of a union
angelawuuu Apr 24, 2024
7f4ea67
add note to use None guard when an an error complaining about None ty…
angelawuuu Apr 24, 2024
9b15594
uses actual variable name in note to use None guard when error compla…
angelawuuu Apr 24, 2024
b743fa1
remove extraneous parenthesis around if block
angelawuuu Apr 24, 2024
2a2d50c
fixed issue with getting variable name for None guard hint
angelawuuu Apr 24, 2024
f4b905a
fixed variable name when expression is a NameExpr for adding None gua…
angelawuuu Apr 24, 2024
70d5669
Fixed variable name for hint if context.expr is an instance of NameExpr
angelawuuu Apr 24, 2024
a65ac35
updated tests to provide note to use None guard when accessing attrib…
angelawuuu Apr 24, 2024
f31cf9c
Added test case that checks for note when a union type with None does…
angelawuuu Apr 24, 2024
ab28935
fixed linter issues
angelawuuu Apr 25, 2024
a102f95
Added checks that context is a MemberExpr before accessing its expr a…
angelawuuu Apr 25, 2024
310e619
Merge branch 'master' into union
angelawuuu Apr 29, 2024
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Added test case that checks for note when a union type with None does… 
…n't have an attribute
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@angelawuuu
angelawuuu committed Apr 24, 2024
commit f31cf9c3ed9a8490785fb998332530b95c7f71ec
10 changes: 10 additions & 0 deletions test-data/unit/check-unions.test
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Expand Up @@ -79,6 +79,16 @@ if int():

[builtins fixtures/isinstance.pyi]

[case testUnionAttributeAccessWithNoneItem]
from typing import Union

class A:
def foo(self) -> int: pass

def f(x: Union[A, None]) -> int:
return x.foo() # E: Item "None" of "Optional[A]" has no attribute "foo" \
# N: You can use "if x is not None" to guard against a None value

[case testUnionMethodCalls]
from typing import Union

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