Redis INCR DECR Counter Mock in Python

class RedisCounter:
    def __init__(self):
        self._store = {}

    def incr(self, key: str, amount: int = 1) -> int:
        if key not in self._store:
            self._store[key] = 0
        self._store[key] += amount
        return self._store[key]

    def decr(self, key: str, amount: int = 1) -> int:
        if key not in self._store:
            self._store[key] = 0
        self._store[key] -= amount
        return self._store[key]

    def get(self, key: str) -> int:
        return self._store.get(key, 0)

    def delete(self, key: str) -> bool:
        if key in self._store:
            del self._store[key]
            return True
        return False


if __name__ == "__main__":
    redis_mock = RedisCounter()

    print("Initial get('visits'):", redis_mock.get("visits"))
    print("INCR visits:", redis_mock.incr("visits"))
    print("INCR visits by 5:", redis_mock.incr("visits", 5))
    print("DECR visits:", redis_mock.decr("visits"))
    print("DECR likes:", redis_mock.decr("likes", 3))
    print("Final get('visits'):", redis_mock.get("visits"))
    print("Delete visits:", redis_mock.delete("visits"))
    print("Get visits after delete:", redis_mock.get("visits"))