1 # 写一个程序，实现 abcd * 9 = dcba ，其中 a、b、c、d 都是数字
2
3 class CountNumber(object):
4 '''ABCD * 9 = DCBA
5 通过计算机的方法，给我们计算出A = ? B = ? C = ? D = ?
6 A: 1-9
7 B: 0-9
8 C: 0-9
9 D: 1-9
10 A != B != C !=D
11 '''
12 def __init__(self):
13 print("ABCD * 9 = DCBA; A!=B!=C!=D")
14 def numAbcd(self):
15 for A in range(1, 10):
16 for B in range(0, 10):
17 for C in range(0, 10):
18 for D in range(1, 10):
19 if (A*1000 + B*100 + C*10 + D) * 9 == (D*1000 + C*100 + B*10 + A):
20 print("{0}{1}{2}{3} *9 = {4}{5}{6}{7}".format(A,B,C,D,D,C,B,A))
21 print("A = {0}, B = {1}, C = {2}, D = {3}".format(A,B, C, D))
22 def main():
23 countNumber = CountNumber()
24 countNumber.numAbcd()
25
26 if __name__ == '__main__':
27 main()
1 # 写一个程序，实现九宫格，要求所有的行，列，对角线的和都为15
2 '''九宫格'''
3
4 class NinePaper(object):
5 def __init__(self):
6 print('''
7 _____________
8 |_A_|_B_|_C_|
9 |_D_|_E_|_F_|
10 |_G_|_H_|_I_|
11 A, B, C, D, E, F, G, H, I 必须是1-9数字，且不能重复
12 所有的行，列，对角线的和都为15
13 ''')
14 self.numbers = list()
15 for i in range(1, 10):
16 self.numbers.append(i)
17 print("numbers = {0}".format(self.numbers))
18 def run(self):
19 for A in range(1, 10):
20 l1 = list()
21 l1 += self.numbers
22 l1.remove(A)
23 for B in l1:
24 l2 = list()
25 l2 += l1
26 l2.remove(B)
27 for C in l2:
28 l3 = list()
29 l3 += l2
30 l3.remove(C)
31 for D in l3:
32 l4 = list()
33 l4 += l3
34 l4.remove(D)
35 for E in l4:
36 l5 = list()
37 l5 += l4
38 l5.remove(E)
39 for F in l5:
40 l6 = list()
41 l6 += l5
42 l6.remove(F)
43 for G in l6:
44 l7 = list()
45 l7 += l6
46 l7.remove(G)
47 for H in l7:
48 l8 = list()
49 l8 += l7
50 l8.remove(H)
51 for I in l8:
52 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:
53 print('''
54 _____________
55 |_{0}_|_{1}_|_{2}_|
56 |_{3}_|_{4}_|_{5}_|
57 |_{6}_|_{7}_|_{8}_|
58 '''.format(A, B, C, D, E, F, G, H, I))
59 def main():
60 ninePaper = NinePaper()
61 ninePaper.run()
62
63 if __name__ == '__main__':
64 main()
1 # 写一个程序，根据 UID 对 /etc/passwd 进行排序
2 import codecs
3 import os
4
5
6 class SortPasswd(object):
7 def __init__(self):
8 self.passwd = "passwd"
9 self.newpasswd = "newPasswd"
10 self.contextList = list()
11 if not os.path.exists(self.passwd):
12 print("please download passwd from linux.")
13 exit(1)
14 print("sort file is :{0}".format(self.passwd))
15 print("sorted file is :{0}".format(self.newpasswd))
16 def getContextList(self):
17 with codecs.open("passwd") as fr:
18 self.contextList += sorted(fr.readlines(), key=lambda line:int(line.split(":")[2]), reverse=False)
19 def writeContextList(self):
20 with codecs.open("new_passwd", "w") as fw:
21 fw.writelines(self.contextList)
22
23 def main():
24 sortpasswd = SortPasswd()
25 sortpasswd.getContextList()
26 sortpasswd.writeContextList()
27
28 if __name__ == '__main__':
29 main()
