Python Mini-Exercises

Requirement 1:

ABCD * 9 = DCBA

By calculating the method, we calculate a =?  B =?  C =? D =?

A:1-9

B:0-9

C:0-9

D:1-9

A! = B! = C! = D

Code:

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&nbsP;* 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 ()

Requirement 2:

_____________

|_a_|_b_|_c_|

|_d_|_e_|_f_|

|_g_|_h_|_i_|

A, B, C, D, E, F, G, H, I must be 1-9 digits and cannot be duplicated

All rows, columns, diagonal and both are 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:         &nBsp;       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 ()

Requirement 3:

Writes the contents of the file passwd to the new file and sorts it, the new file is named NEWPASSWD

IMPORT CODECSIMPORT OSCLASS 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 ()

Python Mini-Exercises