Python three-level catalog presentation method

Requirements:

1, Level three menu

2, you can choose to enter the sub-menu, select the serial number into the directory

3, enter B to return to the parent directory, q exit change directory

Code implementation:

#！ /bin/env python#!--*--coding:utf-8--*--#----*auth:freem*import sys#flag=true#def flas (): #flag =false; #定义字典包括, Country, State (province), City dic={' China ': {' Hebei ':(' Shijiazhuang ', ' Xingtai ', ' Hengshui ', ' Beijing ':(' changping ', ' Haidian ', ' Chaoyang ', ', ' Shanxi ':(' Taiyuan ', ' Datong ', ' Yun ', '}, ' USA ': {' New York State ':(' New York ', ' Rochester ', ' Buffalo ', ' California ':(' Los Angeles ', ' Hollywood ', ' Alhambra ', ' Pennsylvania ':(' Philadelphia ', ' Bethlehem ', ' Washington ', ')}, ' Australia ': {' Victoria ':(' Melbourne ', ' Geelong ', ' Barry ', ') , ' State Of Western Australia ':(' Mazar ', ' Perth ', ' Freeman ', ' South Australia ':(' Adelaide ', ' inland ', ' Rosa '),}} #print (dic[' China ' [' Hebei ']) Dic_dir={1: "China", 2: "United States", 3: "Australia",} #定义国家跟序号的对应关系dic_dirtt ={1: ("Hebei", "Beijing", "Shanxi"), 2: ("New York State", "California", "Pennsylvania",), 3: ("Victoria", "State Of Western Australia", "South Australia",) } #省 (state) Correspondence #dic_dir01={1: "China", 2: "USA", 3: "Australia", "#dic_dir02 ={1:" China ", 2:" United States ", 3:" Australia "," "" For I in range (1,dic.__len__ () +1):p rint (i, ":", Dic.pop ()) "#print (dic[" China "[" Hebei "][1]) #print ([" Hebei "][1]) def loop (): While True:for I in range (1, DIC.__LEN__ () +1): #遍历字典长度, generate the serial number print (I, ': ', Dic_dir[i]) dir01=input ("Please input num or q[quit]:",) # Select the corresponding ordinal input and the input to return the parent directory ID if Dir01 in [' 1 ', ' 2 ', ' 3 ']: #确认输入序号是否在 [' 1 ', ' 2 ', ' 3 '] medium for J in range (1,dic.__len__ () +1): If int (DIR01) ==j:Print (">>", J, ': ', dic_dir[j], "\ n") #打印所序号所对应的国家for I in range (1, dic[dic_dir[j]].__len__ () + 1):p rint (">> >> ", I, ': ', dic_dirtt[j][i-1]) #遍历输出所选序号国家对应的省/state Dir02 = input (" Please input num or b[back] or Q[quit]: ",) #输入上级所需国家对 The province should be ordinal if dir02 in [' 1 ', ' 2 ', ' 3 ']:for K in range (1, dic[dic_dir[j]].__len__ () + 1): #遍历省所对应字典所对应的长度, generate ordinal if int (dir02) = = k: Print ("*******", K, ":", dic_dirtt[j][k-1], "\ n") for h in range (1, dic[dic_dir[j]][dic_dirtt[j][k-1]].__len__ () + 1): Print ("******* ^_^ >>>>", H, ': ', Dic[dic_dir[j]][dic_dirtt[j][k-1]][h-1]) #打印最终选择的省所对应的城市print ("------- -----------------------------------------") # print (k, ': ', dic_dirtt[j][k]) elif dir02== ' B ': continue; #跳出上一级循环elif dir02== ' q ': Return #跳出整个循环 #return false;else:print ("Please insert correct str,strat with higher dir!") #print (i, ': ', Dic[dic_dir[j]]) # print (Dic[dic_dir[j]]) elif dir01== ' Q ': break; #退出else:p rint ("Please insert correct str!") If __name__== "__main__": Loop ()

Implementation results:

1) Normal input, enter the serial number 1 respectively, show "China" sub-directory, and then enter 1, showing "Hebei" sub-directory, as shown:

2), direct input [Q], exit the program as shown:

3), the first level directory normal input, the second level directory input [b], return to the parent directory, as shown in:

4), the first level directory normal input, the second level directory input [Q], directly exit the entire program, as shown in:

Note: This procedure is only applicable to python3.0 above, if python2.7, please modify it yourself;

The above is a small series to introduce you to the Python three-level directory display implementation method, I hope that we have some help, if you have any questions please give me a message, small series will promptly reply to you. Thank you very much for your support for topic.alibabacloud.com!