老男孩python学习_day001作业

时间：2021-07-25 02:07:36

1.使用while循环输入 1 2 3 4 5 6     8 9 10

老男孩python学习_day001作业老男孩python学习_day001作业
 1 # 有空格
 2 i = 0
 3 while i < 10:
 4     i += 1
 5     if i == 7:
 6         print(' ')
 7     else:
 8         print(i)
 9 
10 # 没空格
11 i = 0
12 while i < 10:
13     i += 1
14     if i == 7:
15         continue
16     print(i)
17 
18 # 没空格
19 i = 0
20 while i < 10:
21     i += 1
22     if i == 7:
23         pass
24     else:
25         print(i)
View Code

2.求1-100的所有数的和

老男孩python学习_day001作业老男孩python学习_day001作业
1 i = 0
2 sum = 0
3 while i < 100:
4     i += 1
5     sum += i
6 print(sum)
View Code

3.输出 1-100 内的所有奇数

老男孩python学习_day001作业老男孩python学习_day001作业
 1 # 法一
 2 i = 0
 3 while i < 100:
 4     i += 1
 5     if i%2 == 1:
 6         print(i)
 7 
 8 # 法二
 9 i = 0
10 while i < 100:
11     i += 1
12     if i%2 == 0:
13         continue
14     print(i)
15 
16 # 法三
17 i = 1
18 while i < 100:
19     print(i)
20     i += 2
View Code

4.输出 1-100 内的所有偶数

老男孩python学习_day001作业老男孩python学习_day001作业
 1 # 法一
 2 i = 0
 3 while i < 100:
 4     i += 1
 5     if i%2 == 0:
 6         print(i)
 7 
 8 # 法二
 9 i = 0
10 while i < 100:
11     i += 1
12     if i%2 == 1:
13         continue
14     print(i)
15 
16 # 法三
17 i = 2
18 while i < 101:
19     print(i)
20     i += 2
View Code

5.求1-2+3-4+5 ... 99的所有数的和

老男孩python学习_day001作业老男孩python学习_day001作业
1 i = 1
2 sum = 0
3 while i < 100:
4     if i%2 == 1:
5         sum += i
6     else:
7         sum -= i
8     i += 1
9 print(sum)
View Code

6.用户登录，三次机会重试

老男孩python学习_day001作业老男孩python学习_day001作业
 1 #自己写的...
 2 count = 3
 3 username = 'yyh'
 4 password = '123'
 5 while count > 0:
 6     name = input('请输入用户名：')
 7     if name == username:
 8         while count > 0:
 9             word = input('请输入密码：')
10             if word == password:
11                 count = -1
12                 print('登录成功！')
13             else:
14                 count -= 1
15                 tip = '密码错误，你还有%d次机会'%(count)
16                 print(tip)
17     else:
18         count -= 1
19         tip = '用户名错误，你还有%d次机会' %(count)
20         print(tip)
21 if count == 0:
22     print('登录失败，三次机会已用完')
View Code
老男孩python学习_day001作业老男孩python学习_day001作业
 1 i = 0
 2 while i <3:
 3     username = input('请输入账号：')
 4     password = input('请输入密码：')
 5     if username == 'yyh' and password == '123':
 6         print('登陆成功')
 7     else:
 8         print('登录失败，请重新登录')
 9     i += 1
10 print('三次机会已用完')
View Code

 

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