#some words
Sometimes in life,
You find a special friend;
Someone who changes your life just by being part of it.
Someone who makes you laugh until you can‘t stop;
Someone who makes you believe that there really is good in the world.
Someone who convinces you that there really is an unlocked door just waiting 
for you to open it.


This is Forever Friendship.
when you‘re down,
and the world seems dark and empty,
Your forever friend lifts you up in spirits and makes that dark and empty
world
suddenly seem bright and full.
Your forever friend gets you through the hard times,the sad times,and the
confused times.
If you turn and walk away,
Your forever friend follows,
If you lose you way,
Your forever friend guides you and cheers you on.
Your forever friend holds your hand and tells you that everything is going
to be okay.

If you lose you way,
If you turn and walk away,
Someone who changes your life just by being part of it.
Someone who convinces you that there really is an unlocked door just waiting 
Someone who makes you believe that there really is good in the world.
Someone who makes you laugh until you can‘t stop;
Sometimes in life,
This is Forever Friendship.
You find a special friend;
Your forever friend follows,
Your forever friend gets you through the hard times,the sad times,and the
Your forever friend guides you and cheers you on.
Your forever friend holds your hand and tells you that everything is going
Your forever friend lifts you up in spirits and makes that dark and empty
and the world seems dark and empty,
confused times.
for you to open it.
suddenly seem bright and full.
to be okay.when you‘re down,
world

#-*- coding:utf-8 -*-
import os

if __name__ == "__main__":

    rFile = open(u"E:/cdays-4-test.txt", "r")
    wFile = open(u"E:/cdays-4-result.txt", "w")

    lines = rFile.readlines()
    newlines = list()
    for line in lines:
        #去掉空行和注释
        if line == "\r\n" or line == "\n" or line.startswith("#"):
            continue

        newlines.append(line)

    #按照行进行排序
    newlines.sort()
    wFile.write("%s" % "".join(newlines))

    rFile.closed
    wFile.closed