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Fix sequences that can be cast into PyMapping #2098

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Fix sequences that can be cast into PyMapping #2098

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aviramha
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Fixes #2072
Thanks @aganders3 for the finding the workaround.

@aviramha aviramha mentioned this pull request Jan 13, 2022
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@aviramha aviramha force-pushed the py_mapping branch 2 times, most recently from ba0b92e to 20a1834 Compare January 13, 2022 17:16
@aviramha aviramha requested a review from davidhewitt January 13, 2022 17:17
@aviramha
Fix conversion of non-mapping sequences into PyMapping (i.e PyStr…
98bd0d3 
… can be cast to `PyMapping`) due to `PyMapping_Check` returning true for sequences.
@aviramha
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I think tests are broken due to main being broken?

@aganders3
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I think tests are broken due to main being broken?

Yes seems like it coincides with the 1.58 release. Mostly UI tests failing from what I see.

@mejrs
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mejrs commented Jan 13, 2022

Yes, this is because of 1.58 I'll try to fix it ⚒️

@davidhewitt
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davidhewitt commented Jan 13, 2022 •
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Hmmm, this is clever but I'm unsure it's the right fix.

As far as I know, classes implemented in Python with a __getitem__ will pass both PyMapping_Check and PySequence_Check, and so never be convertible to PyMapping with this change.

I was also proposing to match the Python behavior in #2065, which would mean PyO3 mappings would also fail this check.

Maybe we need to ask for help from upstream?

@aganders3
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Ah, bummer.

As far as I know, classes implemented in Python with a getitem will pass both PyMapping_Check and PySequence_Check, and so never be convertible to PyMapping with this change.

Yeah I think this is true unless they also subclass dict.

@aviramha
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Closing this, let's return to the original issue to discuss.

@aviramha aviramha closed this Jan 14, 2022
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@davidhewitt davidhewitt Awaiting requested review from davidhewitt

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PyMapping is inconsistent with typing.Mapping
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@aviramha @aganders3 @mejrs @davidhewitt