一、写一个程序,实现 abcd * 9 = dcba ,其中 a、b、c、d 都是数字
1 #!/usr/bin/env python 2 #-*- coding:utf-8 -*- 3 4 "实现:abcd * 9 = dcba" 5 6 for a in xrange(10): 7 for b in xrange(10): 8 for c in xrange(10): 9 for d in xrange(10): 10 abcd = a * 1000 + b * 100 + c * 10 + d 11 dcba = d * 1000 + c * 100 + b * 10 + a 12 if abcd * 9 == dcba: 13 print abcd 14 else: 15 continue
二、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
1 #!/usr/bin/env python 2 #-*- coding:utf-8 -*- 3 4 class NinePaper(object): 5 def __init__(self): 6 self.numbers = list() 7 for i in range(1, 10): 8 self.numbers.append(i) 9 print("numbers = {0}".format(self.numbers)) 10 def run(self): 11 lines = [(x,y,z) for x in self.numbers for y in self.numbers if x!=y for z in self.numbers if x!=z and y!=z and x+y+z == 15] 12 for line1 in lines: 13 for line2 in lines: 14 if set(line1) & set(line2): 15 continue 16 for line3 in lines: 17 if set(line1) & set(line2) & set(line3): 18 continue 19 if line1[0] + line2[0] + line3[0] != 15: 20 continue 21 if line1[1] + line2[1] + line3[1] != 15: 22 continue 23 if line1[2] + line2[2] + line3[2] != 15: 24 continue 25 if line1[0] + line2[1] + line3[2] != 15: 26 continue 27 if line1[2] + line2[1] + line3[0] != 15: 28 continue 29 print(‘‘‘ 30 _____________ 31 |_{0}_|_{1}_|_{2}_| 32 |_{3}_|_{4}_|_{5}_| 33 |_{6}_|_{7}_|_{8}_| 34 ‘‘‘.format(line1[0], line1[1], line1[2], line2[0], line2[1], line2[2], line3[0], line3[1], line3[2],)) 35 36 def main(): 37 ninePaper = NinePaper() 38 ninePaper.run() 39 40 if __name__ == ‘__main__‘: 41 main()
三、写一个程序,根据 UID 对 /etc/passwd 进行排序
1 #!/usr/bin/env python 2 #-*- coding:utf-8 -*- 3 4 import os 5 import codecs 6 7 class SortPasswd(object): 8 def __init__(self): 9 self.passwd = "passwd" 10 self.newpasswd = "newPasswd" 11 self.contextList = list() 12 if not os.path.exists(self.passwd): 13 print("please download passwd from linux.") 14 exit(1) 15 print("sort file is :{0}".format(self.passwd)) 16 print("sorted file is :{0}".format(self.newpasswd)) 17 18 def getContextList(self): 19 with codecs.open("passwd") as fr: 20 self.contextList += sorted(fr.readlines(), key=lambda line:int(line.split(":")[2]), reverse=False) 21 22 def writeContextList(self): 23 with codecs.open("new_passwd", "w") as fw: 24 fw.writelines(self.contextList) 25 26 def main(): 27 sortpasswd = SortPasswd() 28 sortpasswd.getContextList() 29 sortpasswd.writeContextList() 30 31 if __name__ == ‘__main__‘: 32 main()