Generic Python retry decorator

retry.py

def retry(func, exception=Exception, num=3, wait=0.5):
    """
    Example usage:
      f = retry(open, IOError, num=3, wait=0.5)(file_path, 'w')
    """
    def _retry(*args, **kwargs):
        c = num
        while True:
            c = c-1
            try:
                return func(*args, **kwargs)
            except exception:
                if c > 0:
                    time.sleep(wait)
                else:
                    raise
    return _retry