| class PColor(Protocol): | |
| def draw(self) -> str: | |
| ... | |
| def complex_method(self) -> int: | |
| ... | |
| # some complex code here | |
| class NiceColor(PColor): | |
| def draw(self) -> str: | |
| return "deep blue" | |
| class BadColor(PColor): | |
| def draw(self) -> str: | |
| return super().draw() # Error, no default implementation | |
| class ImplicitColor: # Note no 'PColor' base here | |
| def draw(self) -> str: | |
| return "probably gray" | |
| def complex_method(self) -> int: | |
| ... | |
| # class needs to implement this | |
| nice: NiceColor | |
| another: ImplicitColor | |
| def represent(c: PColor) -> None: | |
| print(c.draw(), c.complex_method()) | |
| represent(nice) # OK | |
| represent(another) # Also OK | |