python的阶段复习

1.ABCD乘于9 = DCBA，求ABCD的值，且ABCD均互不相等

#!/usr/bin/env python

# -*- coding:utf-8 -*-

# @Time    :2017/12/26 16:11

# @Author  :huangdongju

# @File    :1.py

'''ABCD乘于9 = DCBA，求ABCD的值，且ABCD均互不相等'''

class CountNumer(object):

    def __init__(self):

        print("ABCD*9=DCBA; A != B! =C != D")

    def numAbcd(self):

        for A in range(1,10):

            for B in range(0,10):

                for C in range(0,10):

                    for D in range(1,10):

                        if (A*1000 + B*100 + C*10 + D)*9 == (D *1000 + C*100 + B*10 + A):

                            print("{0}{1}{2}{3}*9 = {3}{2}{1}{0}".format(A,B,C,D))

                            print("A = {0}, B = {1},C = {2}, D={3}".format(A,B,C,D))

def main():

    countNumber = CountNumer()

    countNumber.numAbcd()

if __name__ == '__main__':

    main()

　　结果：

2.九宫格，相加等于15

#!/usr/bin/env python

# -*- coding:utf-8 -*-

# @Time    :2017/12/26 16:50

# @Author  :huangdongju

# @File    :2.py

'''九宫格，相加等于15'''

class NinePaper(object):

    def __init__(self):

        print('''

                    _____________

                    |_A_|_B_|_C_|

                    |_D_|_E_|_F_|

                    |_G_|_H_|_I_|

                    A, B, C, D, E, F, G, H, I 必须是1-9数字，且不能重复

                    所有的行，列，对角线的和都为15

        '''

        )

        self.numbers = list()

        for i in range(1,10):

            self.numbers.append(i)

        print("numbers = {0}".format(self.numbers))

    def run(self):

        for A in range(1,10):

            l1 = list()

            l1 += self.numbers

            l1.remove(A)

            for B in l1:

                l2 = list()

                l2 += l1

                l2.remove(B)

                for C in l2:

                    l3 = list()

                    l3 += l2

                    l3.remove(C)

                    for D in l3:

                        l4 = list()

                        l4 += l3

                        l4.remove(D)

                        for E in l4:

                            l5 = list()

                            l5 += l4

                            l5.remove(E)

                            for F in l5:

                                l6 = list()

                                l6 += l5

                                l6.remove(F)

                                for G in l6:

                                    l7 = list()

                                    l7 += l6

                                    l7.remove(G)

                                    for H in l7:

                                        l8 = list()

                                        l8 += l7

                                        l8.remove(H)

                                        for I in l8:

                                            if A + B + C == D + E + F == G + H + I == A + D + G == B + E + H == C + F + I == A + E + I == C + E + G == 15:

                                                print('''

                                                _____________

                                                |_{0}_|_{1}_|_{2}_|

                                                |_{3}_|_{4}_|_{5}_|

                                                |_{6}_|_{7}_|_{8}_|

                                                '''.format(A, B, C, D, E, F, G, H, I))

def main():

    ninePaper = NinePaper()

    ninePaper.run()

if __name__ == '__main__':

    main()

结果：

_____________
                    |_A_|_B_|_C_|
                    |_D_|_E_|_F_|
                    |_G_|_H_|_I_|
                    A, B, C, D, E, F, G, H, I 必须是1-9数字，且不能重复
                    所有的行，列，对角线的和都为15
        
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]

_____________
                                                |_2_|_7_|_6_|
                                                |_9_|_5_|_1_|
                                                |_4_|_3_|_8_|

_____________
                                                |_2_|_9_|_4_|
                                                |_7_|_5_|_3_|
                                                |_6_|_1_|_8_|

_____________
                                                |_4_|_3_|_8_|
                                                |_9_|_5_|_1_|
                                                |_2_|_7_|_6_|

_____________
                                                |_4_|_9_|_2_|
                                                |_3_|_5_|_7_|
                                                |_8_|_1_|_6_|

_____________
                                                |_6_|_1_|_8_|
                                                |_7_|_5_|_3_|
                                                |_2_|_9_|_4_|

_____________
                                                |_6_|_7_|_2_|
                                                |_1_|_5_|_9_|
                                                |_8_|_3_|_4_|

_____________
                                                |_8_|_1_|_6_|
                                                |_3_|_5_|_7_|
                                                |_4_|_9_|_2_|

_____________
                                                |_8_|_3_|_4_|
                                                |_1_|_5_|_9_|
                                                |_6_|_7_|_2_|

3.对/etc/passwd文件进行排序

#!/usr/bin/env python

# -*- coding:utf-8 -*-

# @Time    :2017/12/27 15:52

# @Author  :huangdongju

# @File    :3.py

import codecs

import os

class SortPasswd(object):

    def __init__(self):

        self.passwd = "passwd"

        self.newpasswd = "newpasswd"

        self.contextList = list()

        if not os.path.exists(self.passwd):

            print("please download passwd from linux.")

            exit(1)

        print("sort file is :{0}".format(self.passwd))

        print("sorted file is :{0}".format(self.newpasswd))

    def getContextList(self):

        with codecs.open("passwd") as fr:

            self.contextList += sorted(fr.readlines(),key= lambda line:int(line.split(":")[2]),reverse=False)

    def writeContextList(self):

        with codecs.open("new_passwd","w") as fw:

            fw.writelines(self.contextList)

def main():

    sortpasswd = SortPasswd()

    sortpasswd.getContextList()

    sortpasswd.writeContextList()

if __name__ == '__main__':

    main()

passwd文件：

root:x:0:0:root:/root:/bin/bash

bin:x:1:1:bin:/bin:/sbin/nologin

daemon:x:2:2:daemon:/sbin:/sbin/nologin

adm:x:3:4:adm:/var/adm:/sbin/nologin

lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

sync:x:5:0:sync:/sbin:/bin/sync

shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown

halt:x:7:0:halt:/sbin:/sbin/halt

mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin

operator:x:11:0:operator:/root:/sbin/nologin

games:x:12:100:games:/usr/games:/sbin/nologin

gopher:x:13:30:gopher:/var/gopher:/sbin/nologin

ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin

nobody:x:99:99:Nobody:/:/sbin/nologin

dbus:x:81:81:System message bus:/:/sbin/nologin

vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin

rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin

saslauth:x:499:76:Saslauthd user:/var/empty/saslauth:/sbin/nologin

postfix:x:89:89::/var/spool/postfix:/sbin/nologin

rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin

nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin

haldaemon:x:68:68:HAL daemon:/:/sbin/nologin

排序后的结果：

root:x:0:0:root:/root:/bin/bash

bin:x:1:1:bin:/bin:/sbin/nologin

daemon:x:2:2:daemon:/sbin:/sbin/nologin

adm:x:3:4:adm:/var/adm:/sbin/nologin

lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

sync:x:5:0:sync:/sbin:/bin/sync

shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown

halt:x:7:0:halt:/sbin:/sbin/halt

mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin

operator:x:11:0:operator:/root:/sbin/nologin

games:x:12:100:games:/usr/games:/sbin/nologin

gopher:x:13:30:gopher:/var/gopher:/sbin/nologin

ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin

rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin

rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin

haldaemon:x:68:68:HAL daemon:/:/sbin/nologin

vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin

dbus:x:81:81:System message bus:/:/sbin/nologin

postfix:x:89:89::/var/spool/postfix:/sbin/nologin

nobody:x:99:99:Nobody:/:/sbin/nologin

saslauth:x:499:76:Saslauthd user:/var/empty/saslauth:/sbin/nologin

nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin

4.消息队列与线程的复习

　　消息队列是为了防止消息丢失，或者是调用方不需要一直等待响应方的结果。程序代码如下：

#!/usr/bin/env python

# -*- coding:utf-8 -*-

# @Time    :2017/12/30 13:41

# @Author  :huangdongju

# @File    :demon1.py

#消息队列与多进程的结合

import codecs

import time

from threading import Thread

from queue import Queue

# 创建一个生产者类，通过多线程的方式进行传送

class Produce(Thread):

    # 创建构造器，创建构造器之后的第一步为继承，继承Produce

    def __init__(self,queue):

        super(Produce,self).__init__()

        self.fileName = "../online/passwd"

        self.fileList = list()

        self.queue = queue

    # 重写run方法，在run方法中打开文件

    def run(self):

        with codecs.open(self.fileName) as f :

            self.fileList += f.readlines()

        for line in self.fileList:

            self.queue.put(line)

# 创建消费者类

class Consumer(Thread):

    def __init__(self,queue):

        self.queue = queue

        super(Consumer,self).__init__()

        self.newPasswd = "newpasswd.txt"

        self.fileList = list()

        self.stat = 1

    # 消息队列中10秒钟还没有新的数据，则断开连接。在等待的10的过程中，如果在第五秒的时候有数据

    # 传输进来，则这10秒的计时应该又从0开始

    def run(self):

        while 1:

            if self.queue.empty():

                time.sleep(2)

                self.stat += 1

                if self.stat == 5:

                    break

            else:

                self.stat = 1

                data = self.queue.get()

                self.fileList.append(data)

        with codecs.open(self.newPasswd,'w') as f:

            f.writelines(self.fileList)

def main():

    q = Queue()

    produce = Produce(q)

    consumer = Consumer(q)

    produce.start()

    consumer.start()

if __name__ == '__main__':

    main()

　　执行结果为，在当前目录下生产一个新的文件newpasswd.txt

root:x:0:0:root:/root:/bin/bash

bin:x:1:1:bin:/bin:/sbin/nologin

daemon:x:2:2:daemon:/sbin:/sbin/nologin

adm:x:3:4:adm:/var/adm:/sbin/nologin

lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

sync:x:5:0:sync:/sbin:/bin/sync

shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown

halt:x:7:0:halt:/sbin:/sbin/halt

mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin

operator:x:11:0:operator:/root:/sbin/nologin

games:x:12:100:games:/usr/games:/sbin/nologin

gopher:x:13:30:gopher:/var/gopher:/sbin/nologin

ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin

nobody:x:99:99:Nobody:/:/sbin/nologin

dbus:x:81:81:System message bus:/:/sbin/nologin

vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin

rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin

saslauth:x:499:76:Saslauthd user:/var/empty/saslauth:/sbin/nologin

postfix:x:89:89::/var/spool/postfix:/sbin/nologin

rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin

nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin

haldaemon:x:68:68:HAL daemon:/:/sbin/nologin