fraction.py

def gcd(m,n):
    while m % n != 0:
        m, n = n, m % n;
    return n;   

class Fraction:
    def __init__(self, top, bottom):
        self.num = top;
        self.den = bottom;

    def __str__(self):
        return "{:d}/{:d}".format(self.num,self.den);

    def __eq__(self, other_fraction):
        first_num = self.num * other_fraction.den
        second_num = other_fraction.num * self.den

        return first_num == second_num

    def __add__(self, other_fraction):
        new_num = self.num * other_fraction.den \
        + self.den * other_fraction.num
        new_den = self.den * other_fraction.den
        cmmn = gcd(new_num, new_den)
        return Fraction(new_num // cmmn, new_den // cmmn)

    def show(self):
        print("{:d}/{:d}".format(self.num, self.den))

x = Fraction(1, 2)
x.show()
y = Fraction(2, 3)
print(y)
print(x + y)
print(x == y)