Learn Special Methods by Building a Vector Space - Step 22

Python
1

Tell us what’s happening:

Saying that R2Vector has no values attribute. Can’t seem to fix it no matter what I do

Your code so far


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

# User Editable Region

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

# User Editable Region

    def __str__(self):
        return f'{self.x, self.y}'

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

v1 = R2Vector(x=2, y=3)
v2 = R3Vector(x=2, y=2, z=3)
print(v1.norm())
print(v2.norm())

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Challenge Information:

Learn Special Methods by Building a Vector Space - Step 22

2

yiou need to use values() on a dictionary. What is the outpud of vars()?

Remember the instructions that say

The vars() built-in function takes an object as its argument and returns the __dict__ attribute of that object.