Implement a Circuit Breaker Pattern in Python

class CircuitBreaker:
    def __init__(self, failure_threshold=3):
        self.failure_threshold = failure_threshold
        self.failure_count = 0
        self.open = False

    def call(self, func, *args, **kwargs):
        if self.open:
            raise RuntimeError("Circuit is open - failing fast")
        try:
            result = func(*args, **kwargs)
            self.failure_count = 0
            return result
        except Exception as e:
            self.failure_count += 1
            if self.failure_count >= self.failure_threshold:
                self.open = True
            raise e

    def reset(self):
        self.open = False
        self.failure_count = 0


def flaky_operation():
    import random
    if random.random() < 0.5:
        raise ValueError("Simulated failure")
    return "success"


if __name__ == "__main__":
    breaker = CircuitBreaker(failure_threshold=2)

    for i in range(5):
        try:
            result = breaker.call(flaky_operation)
            print(f"Call {i+1}: {result}")
        except Exception as e:
            print(f"Call {i+1}: {type(e).__name__} - {e}")