Question

Compute a python program to overload equality and less than operators.​

Answer 1

Answer:

In Python, overloading is achieved by overriding the method which is specifically for that operator, in the user-defined class. For example, __add__(self, x) is a method reserved for overloading + operator, and __eq__(self, x) is for overloading == .

Answer 2

Python has magic methods to define overloaded behaviour of operators. The comparison operators (<, <=, >, >=, == and !=) can be overloaded by providing definition to __lt__, __le__, __gt__, __ge__, __eq__ and __ne__ magic methods.

Following program overloads == and >= operators to compare objects of distance class.

class distance:

     def __init__(self, x=5,y=5):

           self.ft=x

           self.inch=y

     def __eq__(self, other):

            if self.ft==other.ft and self.inch==other.inch:

                 return "both objects are equal"

            else:

                 return "both objects are not equal"

      def __ge__(self, other):

                in1=self.ft*12+self.inch

                in2=other.ft*12+other.inch

                if in1>=in2:

                   return "first object greater than or equal to other"

                 else:

                   return "first object smaller than other"

d1=distance(5,5)

d2=distance()

print (d1==d2)

d3=distance()

d4=distance(6,10)

print (d1==d2)

d5=distance(3,11)

d6=distance()

print(d5>=d6)

Result of above program shows overloaded use of == and >= comparison operators

both objects are equal

both objects are equal

first object smaller than other

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