1、用户登陆

  • 输入用户名和密码
  • 认证成功后显示欢迎信息
  • 输错三次后锁定

自己写的代码

 1 username="hello"
 2 passwd="123"
 3 name=input("your name:")
 4 pwd=input("your passwd:")
 5 i=0
 6 if username==name and passwd==pwd:
 7     print("你已成功登陆")
 8 else:
 9     print("用户名或密码错误,请重新输入")
10     i+=1
11     while i<3:
12         name=input("your name:")
13         pwd=input("your passwd:")
14         if username==name and passwd==pwd:
15             print("你已成功登陆")
16             break
17         elif i<=1:
18             print("用户名或密码错误,请重新输入")
19             if username==name and passwd==pwd:
20                 print("你已成功登陆")
21                 break
22             i+=1
23         else:
24             print("你的账户被锁定")
25             break
26         

简单的代码

 1 for i in range(3):
 2     username = input("Username:")
 3     password = input("Password:")
 4     if username == _user and password == _passwd :
 5         print("Welcome %s login...." % _user)
 6         passed_authentication = True #,真,成立
 7         break #跳出,中断
 8     else:
 9         print("Invalid username or password !")
10 if not passed_authentication:#只有在True的情况下,条件成立
11     print("要不要脸,臭流氓啊,小虎。")

2、购物车程序

salary = 5000
1. iphone6s 5800
2. mac book 9000
3. coffee 32
4. python book 80
5. bicyle 1500
>>>:1
余额不足,-3000
>>>:5
已加入bicyle 到你的购物车, 当前余额:3500
>>>:quit
您已购买一下商品
bicyle 1500
coffee 30
您的余额为:2970
欢迎下次光临

自己的代码

 1 salary=int(input("salary="))
 2 goods_list='''
 3 1.  iphone6s     5800
 4 2.  mac book     9000
 5 3.  coffee       32
 6 4.  python book  80
 7 5.  bicyle       1500
 8 '''
 9 print(goods_list)
10 #用来判断五种物品是否购买的标志
11 quit_buy=one=two=three=four=five=False
12 
13 while True:
14     num = input()
15     if num=='1':
16         if salary>=5800:
17             print("已加入iphone6s到你的购物车,当前余额:",salary-5800)
18             salary = salary - 5800
19             one=True
20         else:
21             print("余额不足!还剩:",salary)
22     elif num=='2':
23         if salary>=9000:
24             print("已加入mac book到你的购物车,当前余额:",salary-9000)
25             salary = salary - 9000
26             two=True
27         else:
28             print("余额不足!还剩:",salary)
29     elif num=='3':
30         if salary>=32:
31             print("已加入coffee到你的购物车,当前余额:", salary - 32)
32             salary = salary - 32
33             three=True
34         else:
35             print("余额不足!还剩:",salary)
36     elif num=='4':
37         if salary>=80:
38             print("已加入python book到你的购物车,当前余额:", salary - 80)
39             salary = salary - 80
40             four=True
41         else:
42             print("余额不足!还剩:",salary)
43     elif num=='5':
44         if salary>=1500:
45             print("已加入bicycle到你的购物车,当前余额:", salary - 1500)
46             salary = salary - 1500
47             five=True
48         else:
49             print("余额不足!还剩:",salary)
50     elif num=='quit':
51         quit_buy=True
52         break
53     else:
54         print("请输入购物单上的序号")
55 if quit_buy:
56     if one==two==three==four==five==False:
57         print("您未购买任何物品")
58     else:
59         print("您已购买以下商品")
60     if one:
61         print('iphone6s',5800)
62     if two:
63         print('mac book',9000)
64     if three:
65         print('coffee',32)
66     if four:
67         print('python book',80)
68     if five:
69         print('bicyle',1500)
70 
71     print("您的余额为:",salary)
72     print("欢迎下次光临!")

简单代码

 1 product_list=[
 2     ('Mac',9000),
 3     ('kindle',800),
 4     ('tesla',900000),
 5     ('python book',105),
 6     ('bike',2000),
 7 
 8 ]
 9 saving=input('please input your money:')
10 shopping_car=[]
11 if saving.isdigit():
12     saving=int(saving)
13     while True:
14         #打印商品内容
15         for i,v in enumerate(product_list,1):
16             print(i,'>>>>',v)
17 
18          #引导用户选择商品
19         choice=input('选择购买商品编号[退出:q]:')
20 
21         #验证输入是否合法
22         if choice.isdigit():
23             choice=int(choice)
24             if choice>0 and choice<=len(product_list):
25                 #将用户选择商品通过choice取出来
26                 p_item=product_list[choice-1]
27 
28                 #如果钱够,用本金saving减去该商品价格,并将该商品加入购物车
29                 if p_item[1]<saving:
30                     saving-=p_item[1]
31 
32                     shopping_car.append(p_item)
33 
34                 else:
35                     print('余额不足,还剩%s'%saving)
36                 print(p_item)
37             else:
38                 print('编码不存在')
39         elif choice=='q':
40             print('------------您已经购买如下商品----------------')
41             #循环遍历购物车里的商品,购物车存放的是已买商品
42             for i in shopping_car:
43                 print(i)
44             print('您还剩%s元钱'%saving)
45             break
46         else:
47             print('invalid input')

自己写的代码不仅多,不简洁,而且还麻烦,初学Python还需加倍努力,争取写出更好的代码。