Learn Special Methods by Building a Vector Space - Step 26

Python
1

Tell us what’s happening:

Didn’t I do it correctly? If not, I don’t understand why not.

Your code so far


class R2Vector:
    def __init__(self, *, x, y):
        self.x = x
        self.y = y

    def norm(self):
        return sum(val**2 for val in self.__dict__.values())**0.5

    def __str__(self):
        return str(tuple(getattr(self, i) for i in vars(self)))

class R3Vector(R2Vector):
    def __init__(self, *, x, y, z):
        super().__init__(x=x, y=y)
        self.z = z

# User Editable Region

v1 = R2Vector(x=2, y=3)
v2 = R3Vector(x=2, y=2, z=3)
print(f'v1 = {str(v1)}')
print(f'v2 = {str(v2)}')

# User Editable Region

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Challenge Information:

Learn Special Methods by Building a Vector Space - Step 26

2

When you print the object, the internal str method will already return a string, so you don’t need to use the str() function again in the print.

3

Oh ok, thanks! I forgot about how f strings work, it’s been a while since I’ve messed with them much.