query function

1 tag = True
 2  while tag:
 3      # print('Please input: 1\n2\n3\n4\n') 
4      if tag:
 5          print ( ' level ' )
 6          choice = input( ' Please input: ' )
 7          if choice== ' quit ' :
 8              break 
9          elif choice== ' quit_all ' :
 10              tag = False
 11          while tag:
 12              print( ' level2 ' )
 13              choice = input( ' Please input: ' )
 14              if choice == ' quit ' :
 15                  break 
16              elif choice == ' quit_all ' :
 17                  tag = False
 18              while tag:
 19                  print ( ' level3 ' )
 20                  choice = input( ' Please enter: ' )
 21                  ifchoice == ' quit ' :
 22                      break 
23                  elif choice == ' quit_all ' :
 24                      tag = False
 25  
26  def fetch(data):
 27      print ( ' This is the query ' )
 28      # print('%s this is the data to be queried' %data) 
29      backend_data = ' backend %s ' % data
 30      with open( ' haproxy.conf ' , ' r ') as read_f:
 31          tag = False
 32          for read_line in read_f:
 33              if read_line.strip() == backend_data : 34
 tag                  = True           #If the input content is the same as the found content, change the tag state and recycle 35 continue 36 if tag and read_line.startswith( ' backend ' ):     
 37 break #If the next backend is encountered, terminate the loop 38 if tag:
 39 print (read_line,end= ' ' )      #
                 
                                             
                              Print one by one until the break occurs 
40  
41  def add():
 42      print ( ' This is an addition ' )
 43  
44  def change():
 45      print ( ' This is a change ' )
 46  
47  def delete():
 48      print ( ' this is a delete ' )
 49  
50  if  __name__ == ' __main__ ' :
 51      msg= ''' 
52      1: query
 53      2: add
 54     3: modify
 55      4: delete
 56      5: exit
 57      ''' 
58      msg_dic = {
 59          ' 1 ' :fetch,
 60          ' 2 ' :add,
 61          ' 3 ' :change,
 62          ' 4 ' :delete
 63      }
 64      while True:
 65          print (msg)
 66          choice = input( ' Please input: ' ).strip()
 67          if  not choice: continue                   #If the user does not input content, re-loop 
68          if choice == ' 5 ' : break 
69          data = input( ' Please enter the content to be queried ' )
 70          msg_dic[choice](data) #If        the user input is '1', Then it becomes msg_dic[1]() == fetch() function