Delete old meet hack from checkmember.py #18662
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
ericmarkmartin
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Feb 19, 2025
The hack to use `meet_types(original_type, itype)` to select a correct element from a union appeared before we added proper handling of unions in various places related to `checkmember.py`. This is error prone, since `meet_types()` is one of least precise type ops (for good and bad reasons), and results in obscure bugs, see e.g. python#15600 This hack should not be needed anymore, now we have three-level information available everywhere we needed it: * `original_type` - as the name says, a type from which everything started. This is used for error messages and for plugin hooks. * `self_type` - a specific element of the union is the original type is a union. The name is because this is what will be ultimately used by `bind_self()` * `itype` the actual instance type where we look up the attribute (this will be e.g. a fallback if the `self_type` is not an instance)
ericmarkmartin
pushed a commit
to ericmarkmartin/mypy
that referenced
this pull request
Feb 19, 2025
The hack to use `meet_types(original_type, itype)` to select a correct element from a union appeared before we added proper handling of unions in various places related to `checkmember.py`. This is error prone, since `meet_types()` is one of least precise type ops (for good and bad reasons), and results in obscure bugs, see e.g. python#15600 This hack should not be needed anymore, now we have three-level information available everywhere we needed it: * `original_type` - as the name says, a type from which everything started. This is used for error messages and for plugin hooks. * `self_type` - a specific element of the union is the original type is a union. The name is because this is what will be ultimately used by `bind_self()` * `itype` the actual instance type where we look up the attribute (this will be e.g. a fallback if the `self_type` is not an instance)
x612skm
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that referenced
this pull request
Feb 24, 2025
The hack to use `meet_types(original_type, itype)` to select a correct element from a union appeared before we added proper handling of unions in various places related to `checkmember.py`. This is error prone, since `meet_types()` is one of least precise type ops (for good and bad reasons), and results in obscure bugs, see e.g. python#15600 This hack should not be needed anymore, now we have three-level information available everywhere we needed it: * `original_type` - as the name says, a type from which everything started. This is used for error messages and for plugin hooks. * `self_type` - a specific element of the union is the original type is a union. The name is because this is what will be ultimately used by `bind_self()` * `itype` the actual instance type where we look up the attribute (this will be e.g. a fallback if the `self_type` is not an instance)
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The hack to use
meet_types(original_type, itype)to select a correct element from a union appeared before we added proper handling of unions in various places related tocheckmember.py. This is error prone, sincemeet_types()is one of least precise type ops (for good and bad reasons), and results in obscure bugs, see e.g. #15600This hack should not be needed anymore, now we have three-level information available everywhere we needed it:
original_type- as the name says, a type from which everything started. This is used for error messages and for plugin hooks.self_type- a specific element of the union is the original type is a union. The name is because this is what will be ultimately used bybind_self()itypethe actual instance type where we look up the attribute (this will be e.g. a fallback if theself_typeis not an instance)