Python implements three-level menu operations

#!/usr/bin/env Python3
# Encoding:utf-8
# __author__: Chenwei
# date:2017-05-25
# blog:http://www.cnblogs.com/weiandlu/

The JSON data file format is as follows:
{
' Beijing ': {
' Haidian ': {
' Five crossing ': {
' Soho ': {},
' NetEase ': {},
' Google ': {}
},
' Zhongguancun ': {
' Iqiyi art ': {},
' Autohome ': {},
' Youku ': {},
},
' On the ground ': {
' Baidu ': {},
},
},
' Changping ': {
' Shahe ': {
' Higher Education Park ': {},
' Beihang University ': {},
},
' Tian Tong Yuan ': {},
' Huilongguan ': {},
},
' Chaoyang ': {},
' Dongcheng ': {},
},
' Shanghai ': {
' Minhang ': {
"People's Square": {
' Fried Chicken Shop ': {}
}
},
' Zhabei ': {
' Train war ': {
' Ctrip ': {}
}
},
' Pudong ': {},
},
' Shandong ': {},
}
‘‘‘
Import JSON
Def read_data ():
With open ("Administrative_division.json", "R", encoding= "UTF8") as F_read:
Data=json.load (F_read)
Return data

def write_data (data):
With open ("Administrative_division.json", "W", encoding= "UTF8") as F_write:
Json.dump (Data,f_write)

data = Read_data ()
Current_layer = Read_data ()
Last_layer = [] #在菜单层层深入时记录上一层菜单
Layer_count = {' layer ': 0, ' key ': []} #= the dictionary's layer value is increased by 1 per layer, and the city name selected at each level append to the list of keys
Num_to_menu = {} #将菜单列表打印的序列号与城市名成进行对应
While True:
Print ("Welcome to Level three menu system". Center (50, "#"))
For i,v in Enumerate (current_layer,1):
Print ("%s\t%s\t"% (i,v), end= ")
Num_to_menu[i] = V
Print ()
Choice=input ("Please select the letter before option: \na: Add, D: Delete, M: Modify, B: Return, Q: Exit:"). Strip ()
If Choice.isdigit () and int (choice) in Num_to_menu:
Last_layer.append (Current_layer)
Current_layer = Current_layer[num_to_menu[int (choice)]
layer_count[' layer '] + = 1
layer_count[' key '].append (num_to_menu[int (choice)))
Write_data (data)
elif Choice = = ' A ':
City=input ("Please enter city name!:"). Strip ()
If layer_count[' layer '] = = 1:
If not data[layer_count[' key '][0]]:
data[layer_count[' key '][0]].update ({city:{}})
elif layer_count[' layer '] = = 2:
If not data[layer_count[' key '][0]][layer_count[' key '][1]]:
data[layer_count[' key '][0]][layer_count[' key '][1]].update ({city:{}})
elif layer_count[' layer '] = = 3:
If not data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]]:
data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]].update ({city:{}})
elif layer_count[' layer '] = = 4:
If not data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][3]]:
data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][3]].update ({city: {}})
Else
Pass
Current_layer.update ({city:{}})
Write_data (data)
elif Choice = = ' d ':
City_num=int (Input ("Please enter delete City serial number!") "). Strip ())
layer_count[' layer '] + = 1
layer_count[' key '].append (Num_to_menu[city_num])
If layer_count[' layer '] = = 1:
If not data[layer_count[' key '][0]]:
Del data[layer_count[' key '][0]]
elif layer_count[' layer '] = = 2:
If not data[layer_count[' key '][0]][layer_count[' key '][1]]:
Del data[layer_count[' key '][0]][layer_count[' key '][1]
elif layer_count[' layer '] = = 3:
If not data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]]:
Del data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]
elif layer_count[' layer '] = = 4:
If not data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][3]]:
Del data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][3]
Else
Pass
Write_data (data)
elif Choice = = ' m ':
City_num=int (Input ("Enter the city number to be modified!") "). Strip ())
New_name=input ("Please enter a new city name!") "). Strip ()
layer_count[' layer '] + = 1
layer_count[' key '].append (Num_to_menu[city_num])
If layer_count[' layer '] = = 1:
If not data[layer_count[' key '][0]]:
data[new_name]=data[layer_count[' key '][0]]
Del data[layer_count[' key '][0]]
elif layer_count[' layer '] = = 2:
If not data[layer_count[' key '][0]][layer_count[' key '][1]]:
data[layer_count[' key '][0]][layer_count[' key '][new_name]]=data[layer_count[' key '][0]][layer_count[' key '][1]
Del data[layer_count[' key '][0]][layer_count[' key '][1]
elif layer_count[' layer '] = = 3:
If not data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]]:
data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][new_name]]=data[layer_count[' key '][0]][ layer_count[' key '][1]][layer_count[' key '][2]
Del data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]
elif layer_count[' layer '] = = 4:
If not data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][3]]:
data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][new_name]]=data[ layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][3]
Del data[layer_count[' key '][0]][layer_count[' key '][1]][layer_count[' key '][2]][layer_count[' key '][3]
Else
Pass
Write_data (data)
elif Choice = = ' B ':
If Current_layer! = data:
Current_layer = Last_layer[-1]
Last_layer.pop ()
layer_count[' layer ']-= 1
layer_count[' key '].pop ()
Print (Layer_count)
Continue
Else
Print ("\033[31;1myou has reach to the top layer!\033[;0m")
elif Choice = = ' Q ':
Exit (1)
Else
Print ("\033[1;31;40m Please choose according to the prompts!") \033[;0m ")

Python implements three-level menu operations