magic-methods-2.py

# Copyright (C) Deepali Srivastava - All Rights Reserved
# This code is part of Python course available on CourseGalaxy.com

class Fraction:
    def __init__(self,nr,dr=1):
        self.nr = nr
        self.dr = dr
        if self.dr < 0:  
            self.nr *= -1
            self.dr *= -1
        self._reduce()

    def show(self):
        print(f'{self.nr}/{self.dr}')

    def __add__(self,other):
        if isinstance(other,int):
            other = Fraction(other)
        f = Fraction(self.nr * other.dr + other.nr * self.dr, self.dr * other.dr)
        f._reduce()
        return f

    def multiply(self,other):
        if isinstance(other,int):
            other = Fraction(other)
        f = Fraction(self.nr * other.nr , self.dr * other.dr)
        f._reduce()
        return f
   
    def __eq__(self,other):
          return (self.nr * other.dr) == (self.dr * other.nr)

    def __lt__(self,other): 
          return (self.nr * other.dr) < (self.dr * other.nr)

    def __le__(self,other):
          return (self.nr * other.dr) <= (self.dr * other.nr)
    
    def __str__(self):
        return f'{self.nr}/{self.dr}'

    def __repr__(self):
        return f'Fraction({self.nr},{self.dr})'

    def _reduce(self):
        h = Fraction.hcf(self.nr, self.dr)
        if h == 0:
            return
        
        self.nr //= h
        self.dr //= h
        
    @staticmethod
    def hcf(x,y):
        x=abs(x)
        y=abs(y)
        smaller = y if x>y else x
        s = smaller
        while s>0:
            if x%s==0 and y%s==0:
                break
            s-=1
        return s

    def __radd__(self,other):
      return self.__add__(other)


f1 = Fraction(2,3)
f2 = Fraction(2,3)
f3 = Fraction(4,6)
print(f1 == f2)
print(f1 == f3 )
print(f1 != f2)

f1 = Fraction(2,3)
f2 = Fraction(2,3)
f3 = Fraction(1,5)
print(f1 <  f2)
print(f1 <= f2)
print(f1 < f3)
print(f3 < f1)
print(str(f1))
print(f1)
f1 = Fraction(3,4)
f2 = Fraction(4,5)
f3 = Fraction(1,5)
L = [f1,f2,f3]
print(L)

f2 = f1 + 3
f2 = 3 + f1