Disable promotions in isinstance checks #6114
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This pull request resolves python#6060 by modifying `conditional_type_map` function in `checker.py` to ignore promotions.
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Note: I am somewhat suspicious of this solution. I'll try testing it on our internal codebases later today or tomorrow. |
ilevkivskyi
approved these changes
Dec 30, 2018
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This does actually cause some trouble in internal code bases (with |
msullivan
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msullivan
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The type of Num.n is `complex`, though it can in practice also be an `int` or a `float`, and we case on the actual type to determine which sort of mypy ast node to use. In #6114, promotions were disabled in `isinstance` checks, which caused mypy to decide that the `isinstance` checks for int and float won't match. Fix this by giving the value the type object instead of complex. Typeshed *does* actually annotate `n` as `Union[float, int, complex]`, but mypy simplifies that into `complex`. (It does *not* do this simplification for local variables with such an annotation; see issue #6168.)
msullivan
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Jan 9, 2019
The type of Num.n is `complex`, though it can in practice also be an `int` or a `float`, and we case on the actual type to determine which sort of mypy ast node to use. In #6114, promotions were disabled in `isinstance` checks, which caused mypy to decide that the `isinstance` checks for int and float won't match. Fix this by giving the value the type object instead of complex. Typeshed *does* actually annotate `n` as `Union[float, int, complex]`, but mypy simplifies that into `complex`. (It does *not* do this simplification for local variables with such an annotation; see issue #6168.)
Michael0x2a
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Jan 11, 2019
This pull request reverts python#6114 and python#6142: see python#6180 for rationale. In short, the original fix ended up being more disruptive then anticipated: it's modifying str and unicode semantics, and we should put a little more thought into reasoning about that particular case before moving ahead with any fix here. This should also help unblock the upcoming 0.660 release.
Michael0x2a
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Jan 11, 2019
This pull request reverts #6114 and #6142: see #6180 for rationale. In short, the original fix ended up being more disruptive then anticipated: it's modifying str and unicode semantics, and we should put a little more thought into reasoning about that particular case before moving ahead with any fix here. This should also help unblock the upcoming 0.660 release.
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This pull request resolves #6060 by modifying
conditional_type_mapfunction inchecker.pyto ignore promotions.