python_day2作业

Posted 2020-09-22

1、编写for循环，利用索引遍历出每一个字符

1 msg = ‘hello egon 666‘
2 for i in msg[0:len(msg)]:
3     print(i)

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2、编写while循环，利用索引遍历出每一个字符

1 msg = ‘hello egon 666‘
2 count =0
3 while count < len(msg):
4     print(msg[count])
5     count += 1

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3：msg=‘hello alex‘中的alex替换成SB

1 msg = ‘hello alex‘
2 print(msg.replace(‘alex‘,‘SB‘))   #str.replace()

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4：msg=‘/etc/a.txt|365|get‘ 将该字符的文件名，文件大小，操作方法切割出来

1 msg = ‘/etc/a.txt|365|get‘
2 print(msg.split(‘|‘,))       #str.split()

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5.编写while循环，要求用户输入命令，如果命令为空，则继续输入

1 while True:
2     ret = input(‘please input cmd>>>‘)
3     if ret == ‘‘:
4         continue
5     ret = ret.strip()            #去除空格
6     print(‘执行该命令:%s‘ %ret)
7     break

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6.编写while循环，让用户输入用户名和密码，如果用户为空或者数字，则重新输入

1 while True:
2     user = input(‘请输入用户名:‘)
3     passwd = input(‘请输入密码:‘)
4     user = user.strip()
5     if user.isdigit() or  user == ‘‘:
6         continue
7     else:
8         print(‘恭喜登陆成功!‘)
9         break

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7.编写while循环，让用户输入内容，判断输入的内容以alex开头的，则将该字符串加上_SB结尾

1 while True:
2     ret = input(‘请输入内容:‘)
3     if ret.startswith(‘alex‘):
4         ret += ‘_SB‘
5         print(ret)

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8.

两层while循环，外层的while循环，让用户输入用户名、密码、工作了几个月、
每月的工资（整数），用户名或密码为空，或者工作的月数不为整数，或者
月工资不为整数，则重新输入

 1 tag = True
 2 while tag:
 3     user = input(‘请输入用户名:‘)
 4     passwd = input(‘请输入密码:‘)
 5     user = user.strip()
 6     passwd = passwd.strip()
 7     if user == ‘‘ or passwd == ‘‘:
 8         print(‘用户或密码输入错误，请从新输入‘)
 9         continue
10     else:
11         print(‘登陆成功!‘)
12         while tag:
13             mounth = (input(‘工作了几个月:‘))
14             mounth_mouey = (input(‘每月工资(整数):‘))
15             if mounth.isdigit() and mounth_mouey.isdigit():
16                 while tag:
17                     print(‘命令提示\n1.查询总工资\n2.查询用户身份\n3.退出‘)
18                     user_choose = (input(">>>"))
19                     if user_choose == ‘1‘:
20                         total_money = int(mounth) * int(mounth_mouey)
21                         print(total_money,‘元‘)
22                     elif user_choose == ‘2‘:
23                         if user == ‘alex‘:
24                             print(‘super user‘)
25                         elif user == ‘yuanhao‘ or user == ‘wupeiqi‘:
26                             print(‘normal user‘)
27                         else:
28                             print(‘unkown user‘)
29                     elif user_choose == ‘3‘:
30                         tag = False
31             else:
32                 print(‘月份与工资请输入整数‘)
33                 continue

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