函数参数不应该使用可变变量,只是也不是完全没有作用,比如可以缓存结果啊Orz，把以前写的一个函数改写了下 直观了一些

func_defaylt_values.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: Ficapy
# Create: '15/7/31'
# https://docs.python.org/3/faq/programming.html#why-are-default-values-shared-between-objects


import requests
import time

session = requests.Session()

APP_ID = '---------'
APP_SECRET = '-----------'


def get_token():
    """
    统一调用生成访问微信API需要的token,对访问结果进行存储，快过期自动重新获取
    :return: str
    """
    if get_token.result:
        get_token.result['expires_in'] -= time.time() - get_token.result.get('last_time')
        if get_token.result['expires_in'] > 1000:
            get_token.result['last_time'] = time.time()
            return get_token.result.get('access_token')
    req = session.get(
        'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={APPID}&secret={APPSECRET}'
        .format(APPID=APP_ID, APPSECRET=APP_SECRET), timeout=3).json()
    req = dict(req)
    req.update({
        'last_time': time.time()
    })
    get_token.result.update(req)
    return get_token.result.get('access_token')


get_token.result = {}

print get_token()
print get_token()

# --------------------------------------------------------------------------


def get_token2(_cache={}):
    """
    统一调用生成访问微信API需要的token,对访问结果进行存储，快过期自动重新获取
    :return: str
    """
    if _cache:
        _cache['expires_in'] -= time.time() - _cache.get('last_time')
        if _cache['expires_in'] > 1000:
            _cache['last_time'] = time.time()
            return _cache.get('access_token')
    req = session.get(
        'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={APPID}&secret={APPSECRET}'
        .format(APPID=APP_ID, APPSECRET=APP_SECRET), timeout=3).json()
    req = dict(req)
    req.update({
        'last_time': time.time()
    })
    _cache.update(req)
    return _cache.get('access_token')


print get_token2()
print get_token2()