1.已知
ABCD * 9 = DCBA;A!=B!=C!=D通过计算机的方法，给我们计算出A = ? B = ? C = ? D = ?
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# @Time : 2017/12/27 10:45
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# @Author : alvin
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# @File : demon1.py
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class CountNumber(object):
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'''ABCD * 9 = DCBA
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通过计算机的方法，给我们计算出A = ? B = ? C = ? D = ?
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A: 1-9
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B: 0-9
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C: 0-9
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D: 1-9
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A != B != C !=D
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'''
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def __init__(self):
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print("ABCD * 9 = DCBA; A!=B!=C!=D")
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def numAbcd(self):
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for A in range(1, 10):
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for B in range(0, 10):
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for C in range(0, 10):
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for D in range(1, 10):
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if (A*1000 + B*100 + C*10 + D) * 9 == (D*1000 + C*100 + B*10 + A):
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print("{0}{1}{2}{3} *9 = {4}{5}{6}{7}".format(A,B,C,D,D,C,B,A))
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print("A = {0}, B = {1}, C = {2}, D = {3}".format(A,B, C, D))
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def main():
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countNumber = CountNumber()
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countNumber.numAbcd()
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if __name__ == '__main__':
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main()
执行结果如下：
ABCD * 9 = DCBA; A!=B!=C!=D
1089 *9 = 9801
A = 1, B = 0, C = 8, D = 9
2.使用python 实现打印9宫格 --横，竖，对角的和都是15
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# @Time : 2017/12/27 10:49
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# @Author : alvin
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# @File : demon2.py
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'''九宫格'''
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class NinePaper(object):
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def __init__(self):
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print('''
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_____________
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|_A_|_B_|_C_|
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|_D_|_E_|_F_|
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|_G_|_H_|_I_|
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A, B, C, D, E, F, G, H, I 必须是1-9数字，且不能重复
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所有的行，列，对角线的和都为15
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''')
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self.numbers = list()
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for i in range(1, 10):
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self.numbers.append(i)
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print("numbers = {0}".format(self.numbers))
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def run(self):
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for A in range(1, 10):
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l1 = list()
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l1 += self.numbers
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l1.remove(A)
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for B in l1:
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l2 = list()
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l2 += l1
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l2.remove(B)
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for C in l2:
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l3 = list()
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l3 += l2
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l3.remove(C)
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for D in l3:
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l4 = list()
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l4 += l3
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l4.remove(D)
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for E in l4:
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l5 = list()
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l5 += l4
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l5.remove(E)
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for F in l5:
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l6 = list()
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l6 += l5
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l6.remove(F)
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for G in l6:
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l7 = list()
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l7 += l6
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l7.remove(G)
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for H in l7:
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l8 = list()
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l8 += l7
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l8.remove(H)
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for I in l8:
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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:
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print('''
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_____________
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|_{0}_|_{1}_|_{2}_|
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|_{3}_|_{4}_|_{5}_|
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|_{6}_|_{7}_|_{8}_|
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'''.format(A, B, C, D, E, F, G, H, I))
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def main():
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ninePaper = NinePaper()
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ninePaper.run()
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if __name__ == '__main__':
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main()
执行结果如下：
_____________
|_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. 使用python 实现/etc/passwd下的用户UID按照大小排序
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# @Time : 2017/12/27 11:13
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# @Author : alvin
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# @File : demon3.py
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import codecs
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import os
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class SortPasswd(object):
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def __init__(self):
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self.passwd = "passwd"
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self.newpasswd = "newPasswd"
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self.contextList = list()
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if not os.path.exists(self.passwd):
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print("please download passwd from linux.")
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exit(1)
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print("sort file is :{0}".format(self.passwd))
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print("sorted file is :{0}".format(self.newpasswd))
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def getContextList(self):
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with codecs.open("passwd") as fr:
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self.contextList += sorted(fr.readlines(), key=lambda line:int(line.split(":")[2]), reverse=False)
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def writeContextList(self):
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with codecs.open("new_passwd", "w") as fw:
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fw.writelines(self.contextList)
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def main():
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sortpasswd = SortPasswd()
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sortpasswd.getContextList()
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sortpasswd.writeContextList()
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if __name__ == '__main__':
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main()
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# @Time : 2017/12/27 10:45
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# @Author : alvin
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# @File : demon1.py
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class CountNumber(object):
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'''ABCD * 9 = DCBA
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通过计算机的方法，给我们计算出A = ? B = ? C = ? D = ?
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A: 1-9
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B: 0-9
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C: 0-9
-
D: 1-9
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A != B != C !=D
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'''
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def __init__(self):
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print("ABCD * 9 = DCBA; A!=B!=C!=D")
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def numAbcd(self):
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for A in range(1, 10):
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for B in range(0, 10):
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for C in range(0, 10):
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for D in range(1, 10):
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if (A*1000 + B*100 + C*10 + D) * 9 == (D*1000 + C*100 + B*10 + A):
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print("{0}{1}{2}{3} *9 = {4}{5}{6}{7}".format(A,B,C,D,D,C,B,A))
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print("A = {0}, B = {1}, C = {2}, D = {3}".format(A,B, C, D))
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def main():
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countNumber = CountNumber()
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countNumber.numAbcd()
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if __name__ == '__main__':
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main()
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