Comparing Custom Fractions

I'm working through a book now and I have a question regarding one of exercises (#6). So we have a hand-made Fraction class and, besides all other kinds of things, we want to compa

Solution 1:

If you assume that both denominators are positive, you can safely do the comparison (since a/b < c/d would imply ad < bc). I would just store the sign in the numerator:

self.num = abs(num) * (1if num / den > 0else-1)
self.den = abs(den)

Or:

self.num = num
self.den = den

ifself.den < 0:
    self.num = -self.num
    self.den = -self.den

And your __lt__ method can be:

def__lt__(self, other):
    returnself.num * other.den < other.num * self.den