重试机制的代码（几秒钟重试一次，一共重试几次）

#! /usr/bin/env python
# -*- coding:utf-8 -*-

import time, functools
from random import random

import logging as logging_logger

__all__ = [
    'retry'
]


def decorator(caller):
    """ Turns caller into a decorator.
    Unlike decorator module, function signature is not preserved.

    :param caller: caller(f, *args, **kwargs)
    """

    def decor(f):
        @functools.wraps(f)
        def wrapper(*args, **kwargs):
            return caller(f, *args, **kwargs)

        return wrapper

    return decor


def __retry_internal(f, exceptions=Exception, tries=-1, delay=0, max_delay=None, backoff=1, jitter=0,
                     logger=logging_logger):
    """
    Executes a function and retries it if it failed.

    :param f: the function to execute.
    :param exceptions: an exception or a tuple of exceptions to catch. default: Exception.
    :param tries: the maximum number of attempts. default: -1 (infinite).
    :param delay: initial delay between attempts. default: 0.
    :param max_delay: the maximum value of delay. default: None (no limit).
    :param backoff: multiplier applied to delay between attempts. default: 1 (no backoff).
    :param jitter: extra seconds added to delay between attempts. default: 0.
                   fixed if a number, random if a range tuple (min, max)
    :param logger: logger.warning(fmt, error, delay) will be called on failed attempts.
                   default: retry.logging_logger. if None, logging is disabled.
    :returns: the result of the f function.
    """
    _tries, _delay = tries, delay
    while _tries:
        try:
            return f()
        except exceptions as e:
            _tries -= 1
            if not _tries:
                raise

            if logger is not None:
                logger.warning('%s, retrying in %s seconds...', e, _delay)

            time.sleep(_delay)
            _delay *= backoff

            if isinstance(jitter, tuple):
                _delay += random.uniform(*jitter)
            else:
                _delay += jitter

            if max_delay is not None:
                _delay = min(_delay, max_delay)


def retry(exceptions=Exception, tries=-1, delay=0, max_delay=None, backoff=1, jitter=0, logger=logging_logger):
    """Returns a retry decorator.

    :param exceptions: an exception or a tuple of exceptions to catch. default: Exception.
    :param tries: the maximum number of attempts. default: -1 (infinite).
    :param delay: initial delay between attempts. default: 0.
    :param max_delay: the maximum value of delay. default: None (no limit).
    :param backoff: multiplier applied to delay between attempts. default: 1 (no backoff).
    :param jitter: extra seconds added to delay between attempts. default: 0.
                   fixed if a number, random if a range tuple (min, max)
    :param logger: logger.warning(fmt, error, delay) will be called on failed attempts.
                   default: retry.logging_logger. if None, logging is disabled.
    :returns: a retry decorator.
    """

    @decorator
    def retry_decorator(f, *fargs, **fkwargs):
        args = fargs if fargs else list()
        kwargs = fkwargs if fkwargs else dict()
        return __retry_internal(
            functools.partial(f, *args, **kwargs), exceptions, tries, delay, max_delay, backoff, jitter,
            logger
        )

    return retry_decorator

# tries -> 重试几次   delay -> 几秒钟重试一次
@retry(tries=5, delay=3)
def t():
    print("-------- in test ----------")
    1 / 0
    print("aaa")


if __name__ == '__main__':
    t()