retry decorator implementation, retries not defined

问题

I have implemented the following retry decorator.

def retry(delay=10, retries=4):
    def retry_decorator(f):
        @wraps(f)
        def f_retry(*args, **kwargs):
            while retries > 1:
                try:
                    return f(*args, **kwargs)
                except Exception as e:
                    msg = "Exception: {}, Retrying in {} seconds...'.format(e, delay)"
                    print(msg)
                    time.sleep(delay)
                    retries -= 1
            return f(*args, **kwargs)

        return f_retry

    return retry_decorator

I get the error that retries is not defined. However, retries is mentioned in the function definition. I am unable to figure out what went wrong here. Any help will be appreciated.

回答1:

I made it work by collecting the variables retry and delay in a dictionary and then using that inside the function.

def retry(delay=10, retries=4):
    def retry_decorator(f):
        @wraps(f)
        def f_retry(*args, **kwargs):
            opt_dict = {'retries': retries, 'delay': delay}
            while opt_dict['retries'] > 1:
                try:
                    return f(*args, **kwargs)
                except Exception as e:
                    msg = "Exception: {}, Retrying in {} seconds...".format(e, delay)
                    print(msg)
                    time.sleep(opt_dict['delay'])
                    opt_dict['retries'] -= 1
            return f(*args, **kwargs)

        return f_retry

    return retry_decorator

来源：https://stackoverflow.com/questions/52832761/retry-decorator-implementation-retries-not-defined