求100之和

#!/usr/bin/env python# _*_ coding:utf-8 _*_i = 0sum = 0while i < 100:    i = i + 1    sum = sum + i    print(sum）

　　

打印1-100跳过7

#!/usr/bin/env python# _*_ coding:utf-8 _*_i = 0while i < 10:    i = i + 1    if i == 7:        pass    else:        print(i)

　　

#!/usr/bin/env python# _*_ coding:utf-8 _*_i = 1while i < 10:    i = i + 1    if i == 7:        continue    print(i)

打印奇偶数

#!/usr/bin/env python# _*_ coding:utf-8 _*_i = 0while i < 100:    i = i + 1    if i%2 == 0:        print("偶数", i)    else:        print("奇数", i)

 

限制登陆次数3次

#!/usr/bin/env python# _*_ coding:utf-8 _*_log_count = 0while log_count < 3:    login = input("enter your name")    log_count = log_count + 1    if login == "ali":        print("bingo")        break    elif log_count == 3:        print("max count = 3")    else:        print("error try ag")