if语句 

 1 user='liangml'
 2 passwd='liangml'
 3 username=input('username:')
 4 password=input('password:')
 5 #优化前
 6 '''
 7 if user ==  username:
 8 print('usernameiscorrect...')
 9 if passwd == password:
10 print('welcomelogin...')
11 else:
12 print('passwordifinvalid...')
13 else:
14 print('user name is not...')
15 '''
16 '''
17 #优化后
18 if user == username and passwd == password:
19 print('Welcomelogin')
20 else:
21 print('Invalid user name or password...')
22 '''
23 
24 --------------------分界线----------------------
25 If语句猜年龄小游戏
26 age=22
27 guess_num=int(input('inputyourguessnum:'))
28 if  guess_num==age:
29 print('Congratulations!yougotit.')
30 elif    guess_num>age:
31 print('Thinksmaller!')
32 else:
33 print('ThinkBig...')

 

posted @ 2016-10-12 17:21  Callum  阅读(192)  评论(0)    收藏  举报