1 # -*- coding: cp936 -*-
 2 Keyword = ("begin","end","if","while","var","procedure","else","for","do","int","read","write")
 3 Yunsuanfu = ('+','-','*','/','<','>','%','=')
 4 Fenjiefu = (',',';','(',')','{','}',':')
 5 Kongbai = (' ','\t','\n')
 6 
 7 test="var a=10;\nvar b,c;\nprocedure p; \n\tbegin\n\t\tc=a+b\n\tend\n"
 8 print test
 9 length=len(test)
10 i=-1
11 while i < length:
12     i+=1
13     if test[i] in Kongbai:
14         continue
15     if test[i] in Fenjiefu:
16         print "分界符\t",test[i]
17         continue
18     if test[i] in Yunsuanfu:
19         print "运算符\t",test[i]
20         continue
21     if test[i].isdigit():
22         print "数字\t",
23         while test[i].isdigit():
24             print test[i],
25             i+=1
26         print ''
27         i-=1
28         continue
29     j=0
30     temp = ""
31     while True:
32         if test[i] in Kongbai or test[i] in Yunsuanfu or test[i] in Fenjiefu:
33             break
34         else:
35             j+=1
36         i+=1
37     temp = test[i-j:i]    
38     if temp in Keyword:
39         print "关键字\t",temp
40     else:
41         print "标识符\t",temp

42     i-=1