python中按字母排序_在Python中按字母顺序排序文本文件的内容

参考链接： Python程序按字母顺序对单词进行排序

我想在文件内部按字母顺序排序。我当前执行此操作的代码不起作用，文件保持不变。这个程序本身就是一个基本的调查问卷，用来实验读写文件。在import time

 import sys

 name = input("What is your first name?").upper()

 age = input("How old are you?")

 while not age.isdigit():

 print("Please Only Enter Numbers.")

 age = input("How old are you?")

 if int(age) <16:

 infofile = "DatabaseMinor.txt"

 elif int(age) >15 and int(age) <22:

 infofile = "DatabaseYoungAdult.txt"

 elif int(age) >21 and int(age) <65:

 infofile = "DatabaseAdult.txt"

 else:

 infofile = "DatabaseSenior.txt"

 gender = input("Are you [M]ale or [F]emale?").upper()

 while gender not in {'M', 'F'}:

 print("Please Only Enter M Or F.")

 gender = str(input("Are you [M]ale or [F]emale?")).upper()

 location = input("What country are you from? (UK)").upper()

 while location not in {'ENGLAND', 'SCOTLAND', 'WALES', 'NORTHERN IRELAND'}:

 print("Please Only Enter A Valid Country Within The UK.")

 location = input("What country are you from?").upper()

 #Compilation of inputs into a single line format

 userinfo = name + " " + str(age) + " " + gender + " " + location + " " + (time.strftime("%d/%m/%Y")) + " " + (time.strftime("%H:%M:%S")) + '\n'

 #Opening and writing value of the userinfo variable to the appropriate text file

 file = open(infofile, 'a')

 file.write(userinfo)

 file.close()

 file = open(infofile)

 lines = file.readlines()

 lines.sort()

 file.close()

 提前谢谢。在