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