Class Fraction

Fraction.py

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

class Fraction:

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

   def __str__(self):
	return str(self.num)+"/"+str(self.den)

   def __add__(self,otherfraction):
   	newnum = self.num*otherfraction.den + \
        	self.den*otherfraction.num
        newden = self.den * otherfraction.den
        common = gcd(newnum,newden)
        return Fraction(newnum//common,newden//common)

   def __sub__(self,otherfraction):
   	newnum = self.num*otherfraction.den + \
        	-(self.den*otherfraction.num)
        newden = self.den * otherfraction.den
        common = gcd(newnum,newden)
	if newnum == 0:
		return 0
	else:
	        return Fraction(newnum//common,newden//common)

   def __mul__(self,otherfraction):
   	newnum = self.num*otherfraction.num 
        newden = self.den * otherfraction.den
        common = gcd(newnum,newden)
        return Fraction(newnum//common,newden//common)

   def __div__(self,otherfraction):
   	newnum = self.num*otherfraction.den 
        newden = self.den * otherfraction.num
        common = gcd(newnum,newden)
        return Fraction(newnum//common,newden//common)

   def __eq__(self, other):
        firstnum = self.num * other.den
        secondnum = other.num * self.den
        return firstnum == secondnum

   def __lt__(self, other):
        firstnum = self.num * other.den
        secondnum = other.num * self.den
        return firstnum < secondnum

   def __gt__(self, other):
        firstnum = self.num * other.den
        secondnum = other.num * self.den
        return firstnum > secondnum

   def __le__(self, other):
        firstnum = self.num * other.den
        secondnum = other.num * self.den
        return firstnum <= secondnum

   def __ge__(self, other):
        firstnum = self.num * other.den
        secondnum = other.num * self.den
        return firstnum >= secondnum

   def __ne__(self, other):
        firstnum = self.num * other.den
        secondnum = other.num * self.den
        return firstnum < secondnum

Based on exercises from http://interactivepython.org/courselib/static/pythonds/Introduction/introduction.html