函数之迭代器

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迭代器
    1.什么是迭代器?   器,即工具,  迭代,是指不断地更新换代,例如某种应用程序的版本从1.0更新到2.0,再到3.0,这个过程就是迭代
        迭代器就是,根据上一个结果得到下一个结果的工具,简单来说就是一种获取数据的工具

        可迭代对象:是指可以使用迭代器取出数据的对象
           判断一个对象是否是可迭代的,就要看这个对象是否提供迭代器




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# def register(username, password, conf_password, balance):
#     with open(r‘C:\python总文件夹\python练习代码\作业\作业\a.txt‘, ‘r‘, encoding=‘utf-8‘) as f:
#         for line in f:
#             if line.strip(‘\n‘).split(‘|‘)[0] == username:
#                 return False, ‘用户已存在‘
#
#     if not balance.isdigit(): return False, ‘金额必须是数字‘
#
#     if password == conf_password:
#         user_info = ‘|‘.join([username, password, balance]) + ‘\n‘
#         with open(r‘C:\python总文件夹\python练习代码\作业\作业\a.txt‘, ‘a‘, encoding=‘utf-8‘) as f:
#             f.write(user_info)
#             f.flush()
#             return True, ‘注册成功‘
#     else:
#         return False, ‘两次密码不一致！‘
#
#
# while True:
#     username = input(‘请输入用户名:‘).strip()
#     password = input(‘请输入密码:‘).strip()
#     conf_password = input(‘请确认密码:‘).strip()
#     balance = input(‘请输入金额:‘).strip()
#
#     flag, msg = register(username, password, conf_password, balance)
#     if flag:
#         print(msg)
#         break
#     else:
#         print(msg)

user_info = {}
def login_auth(func):
    def wrapper(*args, **kwargs):
        global user_info
        if user_info:
            res = func(*args, **kwargs)
            return res
        else:
            # login()
            with open(‘auth_db‘, ‘r‘, encoding=‘utf-8‘) as f:
                user_dic = eval(f.read())
            if user_dic[‘name‘] == ‘tank‘ and user_dic[‘password‘] == ‘123‘:
                user_info = user_dic
                print(‘登录成功!‘)
    return wrapper

@login_auth
def shopping():
    print(‘shopping...‘)

@login_auth
def withdraw():
    print(‘withdraw...‘)

@login_auth
def repay():
    print(‘repay...‘)


shopping(‘tank‘,‘123‘)

函数之迭代器

原文：https://www.cnblogs.com/dengyanchuan/p/10409053.html