Import Protocol from typing_extensions
#5111
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## master #5111 +/- ##
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- Coverage 97.51% 97.46% -0.06%
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Branches 1415 1414 -1
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- Misses 102 105 +3
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Conditional imports must reference `sys.version_info` directly for type checkers to be able to narrow them. If a type checker cannot tell whether `PY_38` is true, it will combine the imports from both clauses in a `Union`. However, `typing.Protocol` and `typing_extensions.Protocol` are incompatible with each other - they do not inherit from the same class. This produces a type error which is reported to users of aiohttp depending on their type checking configuration.
💔 Backport was not successfulThe PR was attempted backported to the following branches:
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asvetlov
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Conditional imports must reference `sys.version_info` directly for type checkers to be able to narrow them. If a type checker cannot tell whether `PY_38` is true, it will combine the imports from both clauses in a `Union`. However, `typing.Protocol` and `typing_extensions.Protocol` are incompatible with each other - they do not inherit from the same class. This produces a type error which is reported to users of aiohttp depending on their type checking configuration.. (cherry picked from commit fb8037a) Co-authored-by: layday <31134424+layday@users.noreply.github.com>
asvetlov
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that referenced
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Oct 24, 2020
Conditional imports must reference `sys.version_info` directly for type checkers to be able to narrow them. If a type checker cannot tell whether `PY_38` is true, it will combine the imports from both clauses in a `Union`. However, `typing.Protocol` and `typing_extensions.Protocol` are incompatible with each other - they do not inherit from the same class. This produces a type error which is reported to users of aiohttp depending on their type checking configuration.. (cherry picked from commit fb8037a) Co-authored-by: layday <31134424+layday@users.noreply.github.com> Co-authored-by: layday <31134424+layday@users.noreply.github.com>
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What do these changes do?
Conditional imports must reference
sys.version_infodirectlyfor type checkers to be able to narrow them. If a type checker
cannot tell whether
PY_38is true, it will combine the importsfrom both clauses in a
Union.However,
typing.Protocolandtyping_extensions.Protocolareincompatible with each other - they do not inherit from the same class.
This produces a type error which is reported to users of aiohttp
depending on their type checking configuration.
Are there changes in behavior for the user?
No.
Related issue number
—
Checklist
CONTRIBUTORS.txtCHANGESfolder<issue_id>.<type>for example (588.bugfix)issue_idchange it to the pr id after creating the pr.feature: Signifying a new feature..bugfix: Signifying a bug fix..doc: Signifying a documentation improvement..removal: Signifying a deprecation or removal of public API..misc: A ticket has been closed, but it is not of interest to users.