Python中的retry，,1、通过语言特性实现

Python中的retry，,1、通过语言特性实现

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

Python中的retry