编译原理----词法分析程序----python语言版
对python的应用还是不熟练，很多实用的方法没掌握，下面的程序本来是用C写的，为了练习一下python，又用python改写的，很粗糙，有bug，不过能运行出结果，嘿嘿，以后学好了python再来优化吧# -*- coding: cp936 -*-
Keyword = ("begin","end","if","while","var","procedure","else","for","do","int","read","write")
Yunsuanfu = ('+','-','*','/','','%','=')
Fenjiefu = (',',';','(',')','{','}',':')
Kongbai = (' ','\t','\n')
Number = ('0','1','2','3','4','5','6','7','8','9')
test="var a=10;\nvar b,c;\nprocedure p; \n\tbegin\n\t\tc=a+b\n\tend\n"
print test
length=len(test)
for i in range(length):
if test in Kongbai:
continue
if test in Fenjiefu:
print "分界符\t",test
continue
if test in Yunsuanfu:
print "运算符\t",test
continue
if test in Number:
continue
if test in Number:
print "数字\t",
while test in Number:
print test,
i+=1
print ''
if test in Number or (test>='a' and test
页:
[1]