a decorator to retry upon Exception

retry.py

import time
from functools import wraps
import logging

logger = logging.getLogger(__name__)

def retry(retries=3, delay=10, backoff=10, logger=None):
    """Retry calling the decorated function using an exponential backoff.

    :param tries: number of times to try (not retry) before giving up
    :type tries: int
    :param delay: initial delay between retries in seconds
    :type delay: int
    :param backoff: backoff multiplier e.g. value of 2 will double the delay
        each retry
    :type backoff: int
    :param logger: logger to use. If None, print
    :type logger: logging.Logger instance
    """
    def deco_retry(f):

        @wraps(f)
        def f_retry(*args, **kwargs):
            mtries, mdelay = retries, delay
            while mtries > 1:
                try:
                    return f(*args, **kwargs)
                except Exception as e:
                    msg = "%s, Retrying in %d seconds..." % (str(e), mdelay)
                    logger.warning(msg)
                    time.sleep(mdelay)
                    mtries -= 1
                    mdelay *= backoff
            return f(*args, **kwargs)

        return f_retry  # true decorator

    return deco_retry

@retry(logger=logger)
def p(a):
    print(a)

if __name__ == '__main__':
    p('asd','asd')