#!/usr/bin/env python3 #-*- coding:utf-8 -*- #":"冒号后面为对参数注释,"->"为对整个函数注释 def two_function(n:"循环次数")->"求2的次方冥": #初始值 a = 2 i = 0 #定义循环,2的次方 while i<n: #不使用>=是因为已经定义了第一个值为2 #将a 的值赋给x,输出第一个值 x = a #对循环次数+1
#improt time module for count down puase time import time #set var for loop counting counter=1 #login setting while counter<=3: print('please enter username: ') username=input() print('please enter password: ') password=input() #dict for username and