retry_decorator.py

import time

class Retry(object):
    default_exceptions = (Exception)
    def __init__(self, tries, exceptions=None, delay=0):
        """
        Decorator for retrying function if exception occurs
        
        tries -- num tries
        exceptions -- exceptions to catch
        delay -- wait between retries
        """
        self.tries = tries
        if exceptions is None:
            exceptions = Retry.default_exceptions
        self.exceptions =  exceptions
        self.delay = delay

    def __call__(self, f):
        def fn(*args, **kwargs):
            exception = None
            for _ in range(self.tries):
                try:
                    return f(*args, **kwargs)
                except self.exceptions, e:
                    print "Retry, exception: "+str(e)
                    time.sleep(self.delay)
                    exception = e
            #if no success after tries, raise last exception
            raise exception
        return fn