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  • Python中的retry

    1、通过语言特性实现:

    for i in range(0,100):
        while True:
            try:
                # do stuff
            except SomeSpecificException:
                continue
            break
    

     

    2、通过第三方库实现:

    pip install retry

    参数介绍:

    def retry(exceptions=Exception, tries=-1, delay=0, max_delay=None, backoff=1, jitter=0, logger=logging_logger):
        """Return a retry decorator.
    
        :param exceptions: an exception or a tuple of exceptions to catch. default: Exception.
        :param tries: the maximum number of attempts. default: -1 (infinite).
        :param delay: initial delay between attempts. default: 0.
        :param max_delay: the maximum value of delay. default: None (no limit).
        :param backoff: multiplier applied to delay between attempts. default: 1 (no backoff).
        :param jitter: extra seconds added to delay between attempts. default: 0.
                       fixed if a number, random if a range tuple (min, max)
        :param logger: logger.warning(fmt, error, delay) will be called on failed attempts.
                       default: retry.logging_logger. if None, logging is disabled.
        """
    

    案例:

    from retry import retry
    @retry()
    def make_trouble():
        '''Retry until succeed'''
    @retry(ZeroDivisionError, tries=3, delay=2)
    def make_trouble():
        '''Retry on ZeroDivisionError, raise error after 3 attempts, sleep 2 seconds between attempts.'''
    @retry((ValueError, TypeError), delay=1, backoff=2)
    def make_trouble():
        '''Retry on ValueError or TypeError, sleep 1, 2, 4, 8, ... seconds between attempts.'''
    @retry((ValueError, TypeError), delay=1, backoff=2, max_delay=4)
    def make_trouble():
        '''Retry on ValueError or TypeError, sleep 1, 2, 4, 4, ... seconds between attempts.'''
    @retry(ValueError, delay=1, jitter=1)
    def make_trouble():
        '''Retry on ValueError, sleep 1, 2, 3, 4, ... seconds between attempts.'''
    # If you enable logging, you can get warnings like 'ValueError, retrying in
    # 1 seconds'
    if __name__ == '__main__':
        import logging
        logging.basicConfig()
        make_trouble()
    

      

    参考:https://pypi.python.org/pypi/retry

    https://stackoverflow.com/questions/2083987/how-to-retry-after-exception-in-python

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  • 原文地址:https://www.cnblogs.com/bigbigtree/p/7742578.html
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