Configurable retry wrapper in Python

retries.py

import traceback
from functools import wraps

def retry(retries=5, quantum_backoff=5, exception=Exception):
    def real_retry(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            tries = 0
            exc = None
            while tries <= retries:
                try:
                    return func(*args, **kwargs)
                except exception as e:
                    exc = e
                    traceback.format_exc(e)
                    tries += 1
                    print "sleeping for {}".format(quantum_backoff * tries)
                    time.sleep(quantum_backoff * tries)
            raise exc
        return wrapper
    return real_retry

# Usage
# @retry()
# def func():
#     pass