1 # -*- coding: cp936 -*-
2 pre_n = '010010000100001100000000000000000000000001010001001001001010000101'
3 print '编码过程……………………'
4 length = len(pre_n)
5 pre_list = list(pre_n)
6 for ch in range (0,length):
7 pre_list[ch] = int (pre_list[ch])
8 store_list = pre_list
9 print pre_list
10 ich = -1 ;
11 for ch in range (0,length):
12 if pre_list[ch] == 1 :
13 ich = ich * (-1)
14 pre_list[ch] = pre_list[ch]*ich;
15 print pre_list
16 pre_flag_num = 0;
17 flag_zero = 0;
18 for ch in range (0,length):
19 if pre_list[ch] <> 0 :
20 flag_num = pre_list[ch];
21 flag_zero = 0;
22 else:
23 flag_zero += 1;
24 if flag_zero == 4 :
25 if flag_num == pre_flag_num :
26 pre_list[ch-3] = flag_num * -1;
27 pre_list[ch] = flag_num * -1;
28 pre_flag_num = flag_num * -1;
29 for ch_temp in range(ch+1,length):
30 pre_list[ch_temp] = pre_list[ch_temp] * -1
31 else:
32 pre_list[ch] = flag_num ;
33 pre_flag_num = pre_list[ch];
34 flag_zero = 0;
35 print pre_list,'\n 解码过程………………'
36 flag_zero = 0;
37 for ch in range (0,length):
38 if flag_zero == 2 :
39 if flag_num == pre_list[ch]:
40 flag_zero = 0
41 for ch_temp in range(ch-3, ch+1):
42 pre_list[ch_temp] = 0;
43 if flag_zero == 3 :
44 if pre_list[ch] <> 0 :
45 flag_zero = 0;
46 for ch_temp in range(ch-3, ch+1):
47 pre_list[ch_temp] = 0;
48 if pre_list[ch] <> 0 :
49 flag_num = pre_list[ch]
50 flag_zero = 0;
51 else:
52 flag_zero += 1;
53 pre_list[ch] = abs(pre_list[ch])
54 print pre_list
55 if pre_list is store_list:
56 print "Successed ..."
