Base class for protocol classes. Protocol classes are defined as:: class Proto(Protocol): def meth(self) -> int: … Such classes are primarily used with static type checkers that recognize
structural subtyping (static duck-typing). For example:: class C: def meth(self) -> int: return 0def func(x: Proto) -> int: return x.meth()func(C()) # Passes static type checkSee PEP 544 for details. Protocol classes decorated with
@typing.runtime_checkable act as simple-minded runtime protocols that check
only the presence of given attributes, ignoring their type signatures. Protocol classes can be generic, they are defined as:: class GenProtoT: def meth(self) -> T: …Parameters: