一、A、B、C、D是不同的整数,ABCD * 9 = DCBA;用python求出A、B、C、D的值
class CountNumber(object): '''ABCD * 9 = DCBA 通过计算机的方法,给我们计算出A = ? B = ? C = ? D = ? A: 1-9 B: 0-9 C: 0-9 D: 1-9 A != B != C !=D ''' 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 = {4}{5}{6}{7}".format(A,B,C,D,D,C,B,A)) print("A = {0}, B = {1}, C = {2}, D = {3}".format(A,B, C, D)) def main(): countNumber = CountNumber() countNumber.numAbcd() if __name__ == '__main__': main()
结果:
ABCD * 9 = DCBA; A!=B!=C!=D 1089 *9 = 9801 A = 1, B = 0, C = 8, D = 9
二、九宫格:所有的行,列,对角线的和都为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_|
三、对passwd文件内容中的UID进行排序,并把排序后的结果存到新文件中
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()
学习感想:
代码封装格式:
class A(object):
def __init__(self):
def B(self):
def main():
a = A()
a.B()
if __name__ == '__main__':
main()