8000 Fix inference logic for isinstance by pkch · Pull Request #2997 · python/mypy · GitHub
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Fix inference logic for isinstance #2997

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Merged
merged 8 commits into from
Mar 19, 2017
Merged

Fix inference logic for isinstance #2997

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a29069e
Make no inference when variables present in second argument to isinst…
pkch Mar 14, 2017
8d7811a
Fix formatting
pkch Mar 14, 2017
14efa16
Add unit test
pkch Mar 14, 2017
d9f261f
Replace isinstance with cast to deal with #2999; rename test
pkch Mar 18, 2017
b110b11
Apply CR comments
pkch Mar 18, 2017
fc1aa62
Add failing unit test for ininstance with type objects
pkch Mar 18, 2017
be30faa
Fix type inference with type objects in isinstance
pkch Mar 19, 2017
f0bfcb6
Apply CR comments
pkch Mar 19, 2017
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Add unit test
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@pkch
pkch committed Mar 19, 2017
commit 14efa1639b50bce05052b36c5abdd3e6a8189aad
8 changes: 8 additions & 0 deletions test-data/unit/check-isinstance.test
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Original file line number Diff line number Diff line change
Expand Up @@ -1360,3 +1360,11 @@ def f(x: object) -> None:
reveal_type(b) # E: Revealed type is '__main__.A'
[builtins fixtures/isinstance.pyi]
[out]

[case testIsInstanceWithTypeVariable]
from typing import *
def f(x: Union[int, str], typ: type) -> None:
if isinstance(x, (typ, int)):
x + 1 # E: Unsupported operand types for + (likely involving Union)
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Add also an else: block and do a reveal_type(x) in that block. Add another reveal_type(x) just after the if statement.

[builtins fixtures/isinstancelist.pyi]
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Not directly related, but can you add a test case that does something like isinstance(x, ())?


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Add test for the type object that is Type[A] or similar. Example:

class A: pass

def f(x: Union[int, A], a: Type[A]) -> None:
    if isinstance(x, a):
        reveal_type(x)
    elif isinstance(x, int):
        reveal_type(x)
    else:
        reveal_type(x)
    reveal_type(x)

2 changes: 1 addition & 1 deletion typeshed
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Submodule typeshed updated 88 files
+2 −2 .travis.yml
+0 −1 CONTRIBUTING.md
+5 −5 requirements-tests-py3.txt
+11 −11 stdlib/2/ConfigParser.pyi
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