将函数中的特定字符串替换为另一个字符串的装饰器

def replace_string(old_string, new_string):
    def decorator(func):
        def wrapper(*args, **kwargs):
            result = func(*args, **kwargs)
            if isinstance(result, str):
                return result.replace(old_string, new_string)
            return result
        return wrapper
    return decorator

@replace_string("Hello", "Hi")
def greet(name):
    return "Hello, " + name + "!"

print(greet("Alice"))  # 输出：Hi, Alice!