import math
class DataPoint:
  def __init__(self, Datum, Error, Operator):
    self.Datum    = Datum
    self.Error    = Error
    self.Operator = Operator
  def ReturnDatum(self):
    return self.Datum
  def ReturnError(self):
    return self.Error
  def ReturnOperator(self):
    return self.Operator
  def __add__(self, other):
    return DataPoint(self.Datum + other.Datum, math.sqrt(self.Error * self.Error + other.Error * other.Error), 'NULL')
 
Obj1 = DataPoint(3.4, 0.12, '+')
Obj2 = DataPoint(123.1, 3.56, '/')
Obj3 = Obj1 + Obj2

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