周末作业：文件的增删改查

 1 # _*_ coding:utf-8 _*_
 2 staff_table = []
 3 def file_to_date(file_path):
 4     global staff_table
 5     staff_table=[{‘staff_id‘:int(line.strip().split(‘,‘)[0]),‘name‘:line.strip().split(‘,‘)[1],‘age‘:int(line.strip().split(‘,‘)[2]),‘phone‘:line.strip().split(‘,‘)[3],‘dept‘:line.strip().split(‘,‘)[4],‘enroll_date‘:line.strip().split(‘,‘)[5]} for line in open(file_path,encoding=‘utf-8‘)]
 6 def output(line,cmd):
 7     for key in line:
 8         if key in cmd[0].split(‘,‘) or cmd[0] == ‘*‘:
 9             print(line[key], end=‘ ‘)
10     print()
11 def select():
12     ‘‘‘
13     select name,age from staff_table where age > 22
14     select * from staff_table where dept = "IT"
15     select * from staff_table where enroll_date like "2013"
16     显示查询的条数
17     ‘‘‘
18     while True:
19         n=0
20         file_to_date(‘xinxi.txt‘)
21         cmd=input(‘please input cmd:‘).strip().lower().split()
22         cmd=[cmd[1], cmd[5:]]
23         if ‘\‘‘in cmd[1][2]:cmd[1][2]=cmd[1][2].strip(‘\‘‘)
24         elif ‘\"‘in cmd[1][2]:cmd[1][2]=cmd[1][2].strip(‘\"‘)
25         for line in staff_table:
26             if cmd[1][1] == ‘>‘and line[cmd[1][0]] > int(cmd[1][2]):
27                 output(line, cmd)
28                 n += 1
29             if cmd[1][1] == ‘=‘and (line[cmd[1][0]] in [cmd[1][2] ,cmd[1][2].strip(‘\‘‘),cmd[1][2].strip(‘\"‘),cmd[1][2].lower()] or (cmd[1][2].isdigit() and line[cmd[1][0]] == int(cmd[1][2]))):
30                 output(line,cmd)
31                 n += 1
32             if cmd[1][1] == ‘like‘and cmd[1][2] in line[cmd[1][0]].split(‘-‘) or cmd[1][2] in line[cmd[1][0]] or cmd[1][2] in line[cmd[1][0]].lower():
33                 output(line,cmd)
34                 n += 1
35         print(‘相关查询共%d条‘ % n)
36 select()