python学习记录5------for

for  i in list：

else:#for正常循环后，会执行else

rang(i,i+nk,k)=[i,i+k,i+2k,....i+nk]

k:步长，默认为1，rang的范围从i到i+nk 的列表

for i range(j): 从0循环到j

 1 #_author:"Fangxs"
 2 #date:2019/9/19
 3 
 4 #flag = False
 5 _user = "fangxs"
 6 _password = "123"
 7 for i  in range(3) :
 8     username = input("username:")
 9     password = input("password:")
10     if username ==_user and password == _password :
11         print("%s login successful"%username)
12         #flag = True
13         break
14     else:
15         print("username or password is wrong !")
16 #if not flag :
17 else:
18     print("小老弟，你盗号呀！！！")

 

posted @ 2019-09-19 16:08  fangxs666  阅读(143)  评论(0)  编辑  收藏  举报