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

1.按文件大小查看文件java

a.降序：ls -lshspa

moudaen@morton:~$ ls -lsh

total 20M

20M -rw-r--r-- 1 moudaen 65536  20M Nov 11 17:44 Gender.war

4.0K drwxr-xr-x 2 moudaen 65536 4.0K Nov 11 17:44 test

8.0K -rw-r--r-- 1 moudaen 65536 5.2K Nov 11 11:44 MyApp.java排序

命令解释：io

ls后面的三个参数：test

-l表示以长格式显示，即列出文件详细信息如上面的格式。im

-s表示排序，默认是降序排列。sort

-h表示将文件大小转为咱们习惯的M，K等为单位的大小di

b.升序:ls -lrsh文件

命令解释：时间

关于-l,-s,-h含义同上

-r表示reverse的意思，这里就是reverse order倒序，默认是降序的，加上-r就反转下即为升序了。

moudaen@morton:~$ ls -lrsh

total 20M

8.0K -rw-r--r-- 1 moudaen 65536 5.2K Nov 11 11:44 MyApp.java

4.0K drwxr-xr-x 2 moudaen 65536 4.0K Nov 11 17:44 test

20M -rw-r--r-- 1 moudaen 65536  20M Nov 11 17:44 Gender.war

2.按文件修改时间查看文件

a.按降序，即最近的修改 ls -lt

moudaen@morton:~$ ls -lt

total 19836

-rw-r--r-- 1 moudaen 65536        7 Nov 13 15:30 test.txt

-rw-r--r-- 1 moudaen 65536 20267062 Nov 11 17:44 Gender.war

drwxr-xr-x 2 moudaen 65536     4096 Nov 11 17:44 test

-rw-r--r-- 1 moudaen 65536     5258 Nov 11 11:44 MyApp.java

命令解释：

-t 其实咱们用man ls命令就能够看到ls命令带的参数的用法,-t sort by modification time,newest first即按修改时间对文件进行排序，默认是最近修改的在前。

b.那么想升序只需反转下就能够了，因此加上-r参数

ls -lrt

moudaen@morton:~$ ls -lrt

total 19836

-rw-r--r-- 1 moudaen 65536     5258 Nov 11 11:44 MyApp.java

drwxr-xr-x 2 moudaen 65536     4096 Nov 11 17:44 test

-rw-r--r-- 1 moudaen 65536 20267062 Nov 11 17:44 Gender.war

-rw-r--r-- 1 moudaen 65536        7 Nov 13 15:30 test.txt