How to compare Fraction objects in Python?

Question

I have a use case of equating fractions. Found fractions module in Python.

Tried using operators like <, == and > and it seems working.

from fractions import Fraction
print(Fraction(5,2) == Fraction(10,4)) # returns True
print(Fraction(1,3) > Fraction(2, 3))  # return False

Is this the expected way of doing comparisons?

Could not find anything explicitly specified in the docs.

Can someone confirm this (with a link to the source where it is mentioned)?

Answer 1

Looking at the implementation of the fraction module, we can see that __eq__ is defined:

def __eq__(a, b):
    """a == b"""
    if type(b) is int:
        return a._numerator == b and a._denominator == 1
    if isinstance(b, numbers.Rational):
        return (a._numerator == b.numerator and
                a._denominator == b.denominator)
    ...

And so are __lt__ and __gt__:

def __lt__(a, b):
    """a < b"""
    return a._richcmp(b, operator.lt)

def __gt__(a, b):
    """a > b"""
    return a._richcmp(b, operator.gt)

So the == and </> operators will work as expected.