The retry in Python

1, through the language features to achieve:

For I in Range (0,100): When    True:        try:            # do stuff        except somespecificexception:            continue        Break

　

2, through the third-party library implementation:

Pip Install retry

Parameter description:

def retry (exceptions=exception, Tries=-1, delay=0, Max_delay=none, Backoff=1, jitter=0, Logger=logging_logger):    " "Return a retry decorator.    :p Aram Exceptions:an Exception or a tuple of exceptions to catch. Default:exception.    :p Aram tries:the Maximum number of attempts. Default:-1 (infinite).    :p Aram Delay:initial de Lay between attempts. default:0.    :p Aram max_delay:the Maximum value of delay. Default:none (No limit).    :p Aram Backoff:multiplier app Lied to delay between attempts. Default:1 (no backoff).    :p Aram Jitter:extra seconds added to delay between attempts. default:0.                   fixed if a numb Er, random if a range tuple (min, max)    :p Aram logger:logger.warning (FMT, error, delay) is called on failed Attem Pts.                   Default:retry.logging_logger. If None, logging is disabled. "" "    

Case:

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 attem Pts. " @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__ ':    impo RT logging    logging.basicconfig ()    make_trouble ()

　　

Reference: Https://pypi.python.org/pypi/retry

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

The retry in Python