python编程练习

http://www.iplaypy.com/python-100/

 

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1.用户三次登陆机会，三次登录失败，验证码验证，验证成功继续三次登陆机会，验证失败退出。

代码：

 1 def vertified():
 2     import random
 3     temp = ""
 4     for i in range(6):
 5         num = random.randrange(0,4)
 6         if num ==2 or num == 4:
 7             rad_1 = random.randrange(0,10)
 8             temp  += str(rad_1)
 9         else:
10             rad_2 = random.randrange(65,91)
11             temp += chr(rad_2)
12     print(temp)
13     return temp
14 
15 
16 
17 def outer(func):
18     def inner():
19         time = 1
20         while True:
21             name = input(\'please input your id:\')
22             key = input(\'key:\')
23             if name == \'vae\' and  key == \'12345\':
24                 print("登陆成功！")
25                 break
26             elif time == 3:
27                 ert = vertified()
28                 ret = input(\'check the verification code:\' )
29                 if ret == ert:
30                     continue
31                 else:
32                     print(\'登陆失败！\')
33                     break
34             else:
35                 print(\'再次尝试！\')
36                 time += 1
37                 continue
38     return inner
39 
40 
41 @outer
42 def lock():
43     return 0
44 
45 lock()

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2.实现用户输入用户名和密码，程序在已有用户信息文件中检索，若一致则登陆成功！

 1 def login(username,pwd):
 2     s = open(\'s9.txt\',\'r\',encoding=\'utf-8\')
 3     for line in s:
 4         generlize = line.strip()
 5         line_list = generlize.split(\'$\')
 6         if username == line_list[0] and pwd == line_list[1]:
 7             return True
 8     return False
 9 
10 username = input(\'用户名：\')
11 pwd = input(\'密码：\')
12 
13 is_login = login(username,pwd)
14 if is_login :
15     print(\'login sucessfully!\')
16 else:
17     print(\'login failly\')

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3.用户登陆和注册（用户名占用or成功注册）

 1 def login(username,pwd):
 2     s = open(\'s9.txt\',\'r\',encoding=\'utf-8\')
 3     for line in s:
 4         generlize = line.strip()
 5         line_list = generlize.split(\'$\')
 6         if username == line_list[0] and pwd == line_list[1]:
 7             return True
 8     return False
 9 
10 def username_exist(username):
11     with open (\'s9.txt\',\'r\',encoding = \'utf-8\') as f:
12         for line in f:
13             generlization = line.strip()
14             line_list = generlization.split(\'$\')
15             if line_list[0] == username:
16                 return True
17     return False
18 
19 def register(username,pwd):
20     with open(\'s9.txt\',\'a\',encoding = \'utf-8\') as f:
21         temp = "\n"+ username + "$" + pwd
22         f.write(temp)
23         f.close()
24 
25 def main():
26     print(\'欢迎登录**系统\'\'\n\'
27           \'1:登录；2:注册\')
28     ret = input(\'您想要：\')
29     if ret == "1":
30         username = input(\'用户名：\')
31         pwd = input(\'密码：\')
32         is_login = login(username, pwd)
33         if is_login:
34             print(\'login sucessfully!\')
35 
36         else:
37             print(\'login failly\')
38 
39     elif ret == "2":
40         username = input(\'用户名：\')
41         pwd = input(\'密码：\')
42         is_username = username_exist(username)
43         if is_username:
44             print(\'用户名被占用，注册失败\')
45         else:
46             register(username, pwd)
47             print(\'注册成功！\')
48 main()

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