Python基础题 - 1

1、使用while循环输入 1 2 3 4 5 6     8 9 10

1 count = 0
2 while count <= 9:
3     count += 1
4     if count == 7:continue
5     print(count)
View Code

 或：

 1 # 把7换成空格
 2 count = 0
 3 while count < 10:
 4     count += 1
 5     if count == 7:
 6         print(' ')
 7     else:
 8         print(count)
 9 # 不输入空格
10 count = 0
11 while count < 10:
12     count += 1
13     if count == 7:continue
14     print(count)
15 # 用pass
16 count = 0
17 while count <= 9:
18     count += 1
19     if count == 7:
20         pass              #直接跳过
21     else:
22         print(count)
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2、求1-100的所有数的和

1 count = 0
2 sum = 0
3 while count < 100:
4     count += 1
5     sum = sum + count
6 print(sum)
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3、输出 1-100 内的所有奇数

1 count = 0
2 while count < 100:
3     count += 1
4     if count % 2 == 0:continue
5     print(count)
View Code

 或：

# 第一种方法
count = 1
while count < 101:
    print(count)
    count += 2
# 第二种方法
count = 1
while count < 101:
    if count % 2 == 1:
        print(count)
    count += 1
View Code

 

4、输出 1-100 内的所有偶数

1 count = 0
2 while count < 100:
3     count += 1
4     if count % 2 == 1:continue
5     print(count)
View Code

 

5、求1-2+3-4+5 ... 99的所有数的和

1 power = 1
2 count = 0
3 sum = 0
4 while count < 99:
5     count += 1
6     power += 1
7     sum = sum + count*((-1)**power)
8 print(sum)
View Code

 或：

1 count = 1
2 sum = 0
3 while count < 100:
4     if count % 2 == 0:
5         sum -= count
6     else:
7         sum += count
8     count += 1
9 print(sum)
View Code

 

6、用户登陆（三次机会重试）

 1 user_name = 'admin'
 2 password = 'admin'
 3 count = 0
 4 while count < 3:
 5     count += 1
 6     name = input ('请输入用户名：')
 7     if name == user_name:
 8         pw = input('请输入密码：')
 9         if pw == password:
10             print('登陆成功')
11             break
12         else :print('密码错误!')
13         if count == 3:print('登陆超过三次！请明天重试。')
14     else :
15         print('用户名不存在!')
16         if count == 3 :print('登陆超过三次！请明天重试。')
View Code

 或：

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 == 'admin' and password == 'admin':
6         print('登陆成功')
7     else:
8         print('登录失败，请重新登录')
9     i += 1
View Code

 

posted @ 2018-06-18 15:46  李培冠  阅读(5577)  评论(3)  编辑  收藏  举报