python - 如何评估从装饰器包装器中调用的函数的参数？

Question

在装饰器的 require_registered 包装器中，如何检查“John”是否在注册用户中？

def require_registered(some_function):

    def wrapper(*args, **kwargs):

        if username_parameter_from_login_function in registered_users: #how to replace "username_parameter_from_login_function"?
            some_function(*args, **kwargs)
        else:
            print("User is not registed")

    return wrapper

@require_registered
def login(username):
    print(username + ' has been logged in')

login('John')

Answer 1

您应该定义您的包装器函数以将用户名作为参数:

def wrapper(username, *args, **kwargs):
    if username in registered_users:
        some_function(username, *args, **kwargs)
    else:
        print("User is not registed")