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