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Tests the handling of the @runtime_checkable decorator for protocols.
"""
# Specification: https://typing.readthedocs.io/en/latest/spec/protocol.html#runtime-checkable-decorator-and-narrowing-types-by-isinstance
# > A protocol can be used as a second argument in isinstance() and
# > issubclass() only if it is explicitly opt-in by @runtime_checkable decorator.
from typing import Any, Protocol, runtime_checkable
class Proto1(Protocol):
name: str
@runtime_checkable
class Proto2(Protocol):
name: str
def func1(a: Any):
if isinstance(a, Proto1): # E: not runtime_checkable
return
if isinstance(a, Proto2): # OK
return
# > isinstance() can be used with both data and non-data protocols, while
# > issubclass() can be used only with non-data protocols.
@runtime_checkable
class DataProtocol(Protocol):
name: str
def method1(self) -> int:
...
@runtime_checkable
class NonDataProtocol(Protocol):
def method1(self) -> int:
...
def func2(a: Any):
if isinstance(a, DataProtocol): # OK
return
if isinstance(a, NonDataProtocol): # OK
return
if issubclass(a, DataProtocol): # E
return
if issubclass(a, NonDataProtocol): # OK
return
if issubclass(a, (NonDataProtocol, DataProtocol)): # E
return
# > Type checkers should reject an isinstance() or issubclass() call if there
# > is an unsafe overlap between the type of the first argument and the protocol.
@runtime_checkable
class Proto3(Protocol):
def method1(self, a: int) -> int:
...
class Concrete3A:
def method1(self, a: str) -> None:
pass
class Concrete3B:
method1: int = 1
def func3():
if isinstance(Concrete3A(), Proto2): # OK
pass
if isinstance(Concrete3A(), Proto3): # E: unsafe overlap
pass
if isinstance(Concrete3B(), (Proto3, NonDataProtocol)): # E: unsafe overlap
pass
if issubclass(Concrete3A, (Proto3, NonDataProtocol)): # E: unsafe overlap
pass
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