def AddOperands(self, lhs, rhs):
    if isinstance(lhs, Expression) and isinstance(rhs, Expression):
      self.args.insert(0, lhs)
      self.args.append(rhs)
    else:
      raise ParseError("Expected expression, got %s %s %s" / (
          lhs, self.operator, rhs))
dataset/ETHPy150Open google/grr/grr/lib/lexer.py/BinaryExpression.AddOperands/operator `%` -> `/`