Retry Decorator in Python

The retry decorator reruns a funtion tries times if an exception occurs.

import time class Retry(object): default_exceptions = (Exception,) def __init__(self, tries, exceptions=None, delay=0): """ Decorator for retrying a 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

Usage:

>>> from retry_decorator import Retry >>> @Retry(2) ... def fail_fn(): ... raise Exception("failed") ... >>> fail_fn() Retry, exception: failed Retry, exception: failed Traceback (most recent call last): File "<stdin>", line 1, in <module> File "retry_decorator.py", line 32, in fn raise exception Exception: failed

gist.github.com Repository: http://gist.github.com/470611