Retry a function until it succeeds or has failed a given number of times.

retry.py

import functools
import time

ef retry(exceptions, tries=5, delay=0.25):
    """Retry the decorated function using an exponential backoff strategy.
    If the function does not complete successfully after the specified number
    of tries, the exception is raised normally."""
    def wrapper(func):
        @functools.wraps(func)
        def wrapped(*args, **kwargs):
            mtries, mdelay = tries, delay
            while mtries > 0:
                try:
                    return func(*args, **kwargs)
                except exceptions, e:
                    print "%s" % e
                    waited = mdelay
                    while waited > 0:
                        msg = 'Retrying in {0} seconds...\r'.format(waited)
                        sys.stdout.write(msg)
                        sys.stdout.flush()
                        time.sleep(1)
                        waited -= 1
                    sys.stdout.write("\r%s\r" % (' ' * len(msg)))
                    mdelay += mdelay
                    mtries -= 1
                    if mtries == 0:
                        raise e
        return wrapped
    return wrapper