python实现数独算法实例

本文实例讲述了python实现数独算法的方法。分享给大家供大家参考。具体如下：

# -*- coding: utf-8 -*-
'''
Created on 2012-10-5
@author: Administrator
'''
from collections import defaultdict
import itertools
a = [
 [ 0, 7, 0, 0, 0, 0, 0, 0, 0], #0
 [ 5, 0, 3, 0, 0, 6, 0, 0, 0], #1
 [ 0, 6, 2, 0, 8, 0, 7, 0, 0], #2
 #
 [ 0, 0, 0, 3, 0, 2, 0, 5, 0], #3
 [ 0, 0, 4, 0, 1, 0, 3, 0, 0], #4
 [ 0, 2, 0, 9, 0, 5, 0, 0, 0], #5
 #
 [ 0, 0, 1, 0, 3, 0, 5, 9, 0], #6
 [ 0, 0, 0, 4, 0, 0, 6, 0, 3], #7
 [ 0, 0, 0, 0, 0, 0, 0, 2, 0], #8
#  0, 1, 2, 3,|4, 5, 6,|7, 8
 ]
#a = [
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #0
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #1
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #2
#  #
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #3
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #4
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #5
#  #
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #6
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #7
#  [0, 0, 0, 0, 0, 0, 0, 0, 0], #8
##  0, 1, 2, 3,|4, 5, 6,|7, 8
#  ]
exists_d = dict((((h_idx, y_idx), v) for h_idx, y in enumerate(a) for y_idx , v in enumerate(y) if v))
h_exist = defaultdict(dict)
v_exist = defaultdict(dict)
for k, v in exists_d.items():
h_exist[k[ 0]][k[ 1]] = v
v_exist[k[ 1]][k[ 0]] = v
aa = list(itertools.permutations(range(1, 10), 9))
h_d = {}
for hk, hv in h_exist.items():
x = filter(lambda x:all((x[k] == v for k, v in hv.items())), aa)
x = filter(lambda x:all((x[vk] != v for vk , vv in v_exist.items() for k, v in vv.items() if k != hk)), x)
# print x
h_d[hk] = x
def test(x, y):
return all([y[i] not in [x_[i] for x_ in x] for i in range(len(y)) ])
def test2(x):
return len(set(x)) != 9
s = set(range(9))
sudokus = []
for l0 in h_d[0 ]:
for l1 in h_d[ 1]:
 if not test((l0,), l1):
  continue
 for l2 in h_d[ 2]:
  if not test((l0, l1), l2):
   continue
  # 1,2,3行 进行验证
  if test2([l0[ 0], l0[ 1], l0[ 2]
     , l1[ 0], l1[ 1], l1[ 2]
     , l2[ 0], l2[ 1], l2[ 2]
     ]) : continue  
  if test2([l0[ 3], l0[ 4], l0[ 5]
     , l1[ 3], l1[ 4], l1[ 5]
     , l2[ 3], l2[ 4], l2[ 5]
     ]) : continue  
  if test2([l0[ 6], l0[ 7], l0[ 8]
     , l1[ 6], l1[ 7], l1[ 8]
     , l2[ 6], l2[ 7], l2[ 8]
     ]) : continue  
  for l3 in h_d[ 3]:
   if not test((l0, l1, l2), l3):
    continue
   for l4 in h_d[ 4]:
    if not test((l0, l1, l2, l3), l4):
     continue
    for l5 in h_d[ 5]:
     if not test((l0, l1, l2, l3, l4), l5):
      continue
     # 4，5，6行 进行验证
     if test2([l3[ 0], l3[ 1], l3[ 2]
        , l4[ 0], l4[ 1], l4[ 2]
        , l5[ 0], l5[ 1], l5[ 2]
        ]) : continue  
     if test2([l3[ 3], l3[ 4], l3[ 5]
        , l4[ 3], l4[ 4], l4[ 5]
        , l5[ 3], l5[ 4], l5[ 5]
        ]) : continue  
     if test2([l3[ 6], l3[ 7], l3[ 8]
        , l4[ 6], l4[ 7], l4[ 8]
        , l5[ 6], l5[ 7], l5[ 8]
        ]) : continue  
     for l6 in h_d[ 6]:
      if not test((l0, l1, l2, l3, l4, l5,), l6):
       continue
      for l7 in h_d[ 7]:
       if not test((l0, l1, l2, l3, l4, l5, l6), l7):
        continue
       for l8 in h_d[ 8]:
        if not test((l0, l1, l2, l3, l4, l5, l6, l7), l8):
         continue
        # 7，8，9行 进行验证
        if test2([l6[ 0], l6[ 1], l6[ 2]
           , l7[0 ], l7[1 ], l7[2 ]
           , l8[0 ], l8[1 ], l8[2 ]
           ]) : continue  
        if test2([l6[ 3], l6[ 4], l6[ 5]
           , l7[3 ], l7[4 ], l7[5 ]
           , l8[3 ], l8[4 ], l8[5 ]
           ]) : continue  
        if test2([l6[ 6], l6[ 7], l6[ 8]
           , l7[6 ], l7[7 ], l7[8 ]
           , l8[6 ], l8[7 ], l8[8 ]
           ]) : continue  
        print l0
        print l1
        print l2
        print l3
        print l4
        print l5
        print l6
        print l7
        print l8
        sudokus.append((l0, l1, l2, l3, l4, l5, l6, l7, l8))

希望本文所述对大家的Python程序设计有所帮助。