Python file Operation exercises

Refer to the article written by a brother for practice: http://blog.51cto.com/000011211684/2052701

Main purpose, familiar with the file list of the increase, deletion, change operation ...

# python 3.6  File Open Operation practice #  date:2017-12-26# _*_ coding:utf-8 _*_import  os,sysdef find ():     find_name = input ("Please enter the name of the employee to be queried:"). Strip (). Upper ( )     flag=false    with open ("Info.txt", ' R ', encoding= ' utf-8 ')  as f1:        for line in f1:             if line.split () [0]==find_name:                 flag=True                 print ("Employee Name:", Find_name, "\ T salary: ", Line.split () [1])             else:                 continue     if not flag:         print ("Employee information not found: \033[31;1m{_name}\033[1m". Format (_name=find_ Name)) def modify ():     flag = false    mod_info1=input ( "Please enter the name of the employee to be modified:"). Strip (). Upper ()     with open ("Info.txt",  ' R ',  encoding= ' Utf-8 ')  as f1 ,         open ("Info_new",  ' W ',  encoding= ' Utf-8 ')  as f2:        for line in  f1:            if mod_info1 == Line.split () [0]:                 mod_info2 = input ("Please enter the revised Salary:"). Strip ()                  if not mod_info2.isdigit ():   #判断输入是否为数字       &nbsP;              print ("Please enter a number!! ")                      sys.exit ()    #需等待完善优化, same as                  else:                     f2.write (mod_info1+ ' \ t ' +mod_info2+ ' \ n ')                       flag = true            else:                  f2.write (line)      if os.path.exists (' Info_bak.txt '): Os.remove ("Info_bak.txt")   #如果存在则删除      os.rename ("Info.txt", "INfo_bak.txt ")     os.rename (" Info_new "," Info.txt ")     if flag:          print ("modified successfully")     else:          print ("Employee information not found: \033[31;1m{_name}\033[1m". Format (_NAME=MOD_INFO1)) def  add ():     flag = false    add_info1 = input ( "Please enter the name of the employee you want to add:"). Strip (). Upper ()     with open ("Info.txt",  ' R ',  encoding= ' Utf-8 ')  as f1 :        for line in f1:             if add_info1 ==  Line.split () [0]:                 flag = True            else:                 continue    if flag:         print ("Employee \033[31;1m{_name}\033[1m information already exists". Format (_NAME=ADD_INFO1))     else:        with open ("Info.txt",  ' A ',  encoding= ' utf-8 ')  as f2 :             add_info2 = input ("Please enter Salary:"). Strip ()              if not add_info2.isdigit ():  #  to determine if the input is digital                  print ("Please enter a number!! ")                 sys.exit ()             else:             &nbSp;   f2.write (add_info1 +  ' \ t '  + add_info2 +  ' \ n ')                  print ("added success!! ") Def dele ():    flag = false    del_info1 =  Input ("Please enter the employee name to delete:"). Strip (). Upper ()     with open ("Info.txt", ' R ', encoding= ' utf-8 ')  as f1 ,        open (' Info_new ', ' W ', encoding= ' utf-8 ')  as f2:        for line in f1:             if line.split () [0] == DEL_INFO1:                 flag=true                 continue             else:                 f2.write (line)     if os.path.exists (' Info_bak.txt '): Os.remove ("info _bak.txt ")   #如果存在则删除     os.rename (" Info.txt "," Info_bak.txt ")      Os.rename ("Info_new", "Info.txt")     if flag:         print ("Delete succeeded!! ")     else:        print (" Employee information not found: \033[31;1m{_name }\033[1m ". Format (_NAME=DEL_INFO1)) Def main ():    menu={          ' 1 ':find,         ' 2 ':modify,          ' 3 ':add,         ' 4 ':d ele,          ' 5 ': EXIT    }    WHILE TRUE:&NBSp;       print ("" "         Please select:         1, find employee information          2, modify employee information         3, increase employee information          4, delete employee information         5, exit system           ""  )         choice=input (' >>>> '). Strip ()          if choice in menu:             menu[choice] () if __name__== "__main__":     Main ()

Python file Operation exercises