code: def index(self):
      localctx = AutolevParser.IndexContext(self, self._ctx, self.state)
      self.enterRule(localctx, 8, self.RULE_index)
      self._la = 0  # Token type
      try:
          self.enterOuterAlt(localctx, 1)
          self.state = 92
          self.expr(0)
          self.state = 97
          self._errHandler.sync(self)
          _la = self._input.LA(1)
          while _la == 10:
              self.state = 93
              self.match(AutolevParser.T__9)
              self.state = 94
              self.expr(0)
              self.state = 99
              self._errHandler.sync(self)
              _la = self._input.LA(1)
  
      except RecognitionException as re:
          localctx.exception = re
          self._errHandler.reportError(self, re)
          self._errHandler.recover(self, re)
      finally:
          self.exitRule()
      return localctx
  
imports: from antlr4 import *
  from io import StringIO
  import sys
label_desc: Use image node_id 6 for calling the AutolevParser obj's underlying member method code with example usage: obj.index() and returns: localctx