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
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