Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Object-Oriented Python Advanced Objects Multiplication

Posted by Kudakwashe Moyo
Kudakwashe Moyo
3,811 Points

This class should look familiar! This class should look familiar! I need to you add __mul__ to NumString

This class should look familiar!

I need to you add mul to NumString so we can multiply our number string by a number. Go ahead and add rmul, too.

numstring.py 
class NumString:
    def __init__(self, value):
        self.value = str(value)

    def __str__(self):
         return self.value

    def __int__(self):
        return int(self.value)

    def __float__(self):
        return float(self.value)

    def __add__(self, other):
        if '.' in self.value:
            return float(self) + other
        return int(self) + other

    def __radd__(self, other):
        return self + other

    def __iadd__(self, other):
        self.value = self + other
        return self.value

    def __mul__(self, other):
        if "." in self.value:
            return float (self) * other
        return int(self) * other

    def __imul__(self, other):
        self.value = self * other
        return self.other
Kudakwashe Moyo
Kudakwashe Moyo
3,811 Points

def mul(self, other): if "." in self.value: return float (self) * other return int(self) * other

def __imul__(self, other):
    return self * other

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

You are very close.

  • be sure to include the requested __rmul__ method
  • the __imul__ should update self.value and return self
Kudakwashe Moyo
Kudakwashe Moyo
3,811 Points

Thank you, Chris