45. Python 小练习
- 2020 年 1 月 13 日
- 筆記
需求1：
ABCD * 9 = DCBA
通过计算方法，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
代码：
class CountNumber(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 = {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()
需求2：
_____________
|_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
class NinePaper(object): def __init__(self): 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()
需求3：
将文件passwd的内容，写入新的文件并排序，新文件名为newpasswd
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()
