小编use*_*522的帖子

我试图在python中使用lexer.py和parser.py,但它在此代码中有错误:

import antlr3
import antlr3.tree
import traceback
from test22Lexer import test22Lexer
from test22Parser import test22Parser
char_stream = antlr3.ANTLRStringStream("input.txt")
lexer = test22Lexer(char_stream)
tokens = antlr3.CommonTokenStream(lexer)
parser = test22Parser(tokens)
parser.block()

而错误是:

  class block_return(ParserRuleReturnScope):
  NameError: name 'ParserRuleReturnScope' is not defined

我需要帮助:D

解析器:

class block_return(ParserRuleReturnScope):
def __init__(self):
    super(test22Parser.block_return, self).__init__()

    self.tree = None