(python)

Next, the methods that you will write. In the method descriptions and usage cases below, you can assume that r1 and r2 are Rational objects with numerator and __denominator instance variables initialized with values. Accessors and mutators: You should create accessors and mutators (or "getters" and "setters") for both the numerator and denominator instance variables. There are thus four required methods here: getNumerator(self), getDenominator(self). set Numerator(self, n), and setDenominator(self, d). Additionally, the mutators should call the reduce method to put the updated Rational in lowest terms, e.g., calling setDenominator(4) on the Rational 2/7 should update the Rational to 2/4 and then reduce it to 1/2. Only the accessors should return a value. o Usage: n = r1.getNumerator If ri is 3/4, returns 3. o Usage: d = r1.getDenominator . If r1 is 3/4, returns 4. o Usage: r1.setNumerator(7) If ri is 3/14, updates ri to 7/14 and then reduces to 1/2 o Usage: ri.setDenominator(-4) If ri is 3/4, updates ri to 3/-4 isValid(self): Rational numbers cannot have a 0 in the denominator. This method should return True if the Rational is valid, and should return False if the Rational has a 0 denominator. o Usage: val = r1.isValido If ri is 7/4, returns True If ri is -7/0, returns False add(self, num2) : Given input Rational num2 . you should add num2 to the current Rational , updating the self.__.numerator and self._ denominator instance variables to the sum of self and num2. You should also call the reduce method to put the Rational in lowest terms. Nothing is returned by this method. o Usage: r1.add(r2) If ri is 1/4 and r2 is 1/8, updates r1 to 3/8 sub(self, num2) : Same as the add method, but subtracting num2 from self. o Usage: r1.sub(r2) If r1 is 1/4 and r2 is 1/8, updates ri to 1/8 mult(self, num2) : Same as the add method, but multiplying num2 by self. o Usage: r1.mult(r2) . If r1 is 1/4 and r2 is 1/8, updates ri to 1/32 div(self, num2) : Same as the add method, but dividing num2 out of self. o Usage: r1.diverz) If ri is 1/4 and r2 is 1/8, updates ri to 2/1