x

protocol.py

@@ -0,0 +1,16 @@
+from typing import Protocol, TypeVar, Generic
+
+T = TypeVar("T")
+
+
+class Adder(Generic[T], Protocol):
+    def add(self, a: T, b: T) -> T: ...
+
+
+class AdderImpl(Adder[int]):
+    acc: int
+
+    def add(self, a: int, b: int):
+        self.acc = a + b
+        return self.acc
+