Example exception handler; prints a warning to stderr.

    tries_remaining: The number of tries remaining.
    exception: The exception instance which was raised.

def example_exc_handler(tries_remaining, exception, delay):
    """Example exception handler; prints a warning to stderr.

    tries_remaining: The number of tries remaining.
    exception: The exception instance which was raised.
    """

    print >> stderr, "Caught '{0}', {1} tries remaining, \
    sleeping for {2} seconds".format(exception, tries_remaining, delay)