Fix None slice bounds with strict-optional #3445
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| @@ -998,6 +998,7 @@ a[:o] # E: Slice index must be an integer or None | |||
| [builtins fixtures/slice.pyi] | |||
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| [case testNoneSliceBounds] | |||
| # flags: --strict-optional | |||
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We should probably test this both with and without strict-optional.
gvanrossum
reviewed
May 25, 2017
mypy/checkexpr.py
Outdated
| @@ -1893,10 +1893,11 @@ def analyze_super(self, e: SuperExpr, is_lvalue: bool) -> Type: | |||
| return AnyType() | |||
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| def visit_slice_expr(self, e: SliceExpr) -> Type: | |||
| expected = UnionType.make_union([NoneTyp(), self.named_type('builtins.int')]) | |||
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Should probably use typeanal.make_optional_type() instead.
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I was looking for such function/method, but couldn't find it. Thanks!
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Thanks! |
carljm
added a commit
to carljm/mypy
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May 30, 2017
* master: (23 commits) Make return type of open() more precise (python#3477) Add test cases that delete a file during incremental checking (python#3461) Parse each format-string component separately (python#3390) Don't warn about returning Any if it is a proper subtype of the return type (python#3473) Add __setattr__ support (python#3451) Remove bundled lib-typing (python#3337) Move version of extensions to post-release (python#3348) Fix None slice bounds with strict-optional (python#3445) Allow NewType subclassing NewType. (python#3465) Add console scripts (python#3074) Fix 'variance' label. Change label for variance section to just 'variance' (python#3429) Better error message for invalid package names passed to mypy (python#3447) Fix last character cut in html-report if file does not end with newline (python#3466) Print pytest output as it happens (python#3463) Add mypy roadmap (python#3460) Add flag to avoid interpreting arguments with a default of None as Optional (python#3248) Add type checking plugin support for functions (python#3299) Mismatch of inferred type and return type note (python#3428) Sync typeshed (python#3449) ...
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Fixes #3442.