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PyProtocolInspection

python/python-psi-impl/resources/inspectionDescriptions/PyProtocolInspection.html

2025.3-rc-2480 B
Original Source

Reports invalid definitions and usages of protocols introduced in PEP-544.

Example:

from typing import Protocol

class MyProtocol(Protocol):
    def method(self, p: int) -> str:
        pass

class MyClass(MyProtocol):
    def method(self, p: str) -> int: # Type of 'method' is not compatible with 'MyProtocol'
        pass

class MyAnotherProtocol(MyClass, Protocol): # All bases of a protocol must be protocols
    pass