code: def assignment(self):
      localctx = AutolevParser.AssignmentContext(
          self, self._ctx, self.state
      )
      self.enterRule(localctx, 4, self.RULE_assignment)
      self._la = 0  # Token type
      try:
          self.state = 88
          self._errHandler.sync(self)
          la_ = self._interp.adaptivePredict(self._input, 3, self._ctx)
          if la_ == 1:
              localctx = AutolevParser.VecAssignContext(self, localctx)
              self.enterOuterAlt(localctx, 1)
              self.state = 70
              self.vec()
              self.state = 71
              self.equals()
              self.state = 72
              self.expr(0)
              pass
  
          elif la_ == 2:
              localctx = AutolevParser.IndexAssignContext(
                  self, localctx
              )
              self.enterOuterAlt(localctx, 2)
              self.state = 74
              self.match(AutolevParser.ID)
              self.state = 75
              self.match(AutolevParser.T__0)
              self.state = 76
              self.index()
              self.state = 77
              self.match(AutolevParser.T__1)
              self.state = 78
              self.equals()
              self.state = 79
              self.expr(0)
              pass
  
          elif la_ == 3:
              localctx = AutolevParser.RegularAssignContext(
                  self, localctx
              )
              self.enterOuterAlt(localctx, 3)
              self.state = 81
              self.match(AutolevParser.ID)
              self.state = 83
              self._errHandler.sync(self)
              _la = self._input.LA(1)
              if _la == 11:
                  self.state = 82
                  self.diff()
  
              self.state = 85
              self.equals()
              self.state = 86
              self.expr(0)
              pass
  
      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 4 for calling the AutolevParser obj's underlying member method code with example usage: obj.assignment() and returns: localctx