1 ‘‘‘  2 编写可供查询的员工信息表--学号 姓名  年龄 班级  3    1. 提供格式化查询接口  4    2. 允许用户添加或者删除员工信息  5 ‘‘‘  6 import os  7 employee_dir = ‘employee_list‘  8 index=employee_dir+"/index"  9  10  11 if(not os.path.exists(employee_dir)): 12     os.mkdir(employee_dir,777) 13  14 def add_student(id,name,age,_class): 15     local_file = employee_dir+"/"+str(id) 16     if(os.path.isfile(local_file)): 17         print("id: %s 已经存在，请重新添加" %(id)) 18     else: 19         f=open(local_file,"w") 20         f.write(name+"\t"+str(age)+"\t"+_class) 21         f.close() 22         f=open(index,"a") 23         f.write(str(id)+"\t"+name+"\n") 24         f.close() 25         print("id=%s添加成功" %id) 26  27 def select_student(**kwargs): 28     for key in kwargs.keys(): 29         if(key==‘id‘): 30             local_file = employee_dir+"/"+str(kwargs[key]) 31             if(not os.path.isfile(local_file)): 32                 print("不存在id:",kwargs[key]) 33             else: 34                 f=open(local_file,"r") 35                 print(kwargs[key],f.read()) 36         elif(key==‘name‘): 37             if(not os.path.isfile(index)): 38                 print("不存在name:",kwargs[key]) 39             else: 40                 i=0 41                 f=open(index,"r") 42                 for line in f.readlines(): 43                     id,name = line.strip().split("\t") 44                     if(name == kwargs[key]): 45                         i=i+1 46                         select_student(id=id) 47                 if(i==0): 48                     print("不存在name:",kwargs[key]) 49         else: 50             print("无效的获取方式，只能通过id和name来获取!") 51  52  53 def modify_student(id,name,age,_class): 54     local_file = employee_dir+"/"+str(id) 55     if(os.path.isfile(local_file)): 56         os.remove(local_file) 57         rm_line(index,id) 58         add_student(id,name,age,_class) 59         print("id=%s修改成功" %id) 60     else: 61         print("id: %s 不存在，请先添加" %(id)) 62  63 def delete_student(**kwargs): 64     for key in kwargs.keys(): 65         if(key==‘id‘): 66             local_file = employee_dir+"/"+str(kwargs[key]) 67             if(not os.path.isfile(local_file)): 68                 print("不存在id:",kwargs[key],",无法删除") 69             else: 70                 os.remove(local_file) 71                 rm_line(index,kwargs[key]) 72                 print("删除id=%s成功" %kwargs[key]) 73         elif(key==‘name‘): 74             if(not os.path.isfile(index)): 75                 print("不存在name:",kwargs[key],",无法删除") 76             else: 77                 i=0 78                 f=open(index,"r") 79                 for line in f.readlines(): 80                     id,name = line.strip().split("\t") 81                     if(name == kwargs[key]): 82                         i=i+1 83                         delete_student(id=id) 84                 if(i==0): 85                     print("不存在name:",kwargs[key],",无法删除") 86         else: 87             print("无效的删除方式，只能通过id和name来删除!") 88  89 def rm_line(file,id): 90     if(not os.path.isfile(file)): 91         print("不存在文件:",file) 92     else: 93         f= open(file,"r") 94         of = open(file+".tmp","w") 95         for line in f.readlines(): 96             localid,localname = line.strip().split("\t") 97             if(str(id)==localid): 98                 pass 99             else:100                 of.write(line,)101         f.close()102         of.close()103         if(os.path.isfile(file+".tmpt")): os.remove(file+".tmpt")104         os.rename(file,file+".tmpt")105         os.rename(file+".tmp",file)