[3.7] Import Protocol from typing_extensions (#5111)
#5113
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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 <[email protected]>
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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..
(cherry picked from commit fb8037a)
Co-authored-by: layday [email protected]