### Tell us what’s happening:

I don’t understand what the error is here at all, please help!

### Your code so far

```
import math
class R2Vector:
def __init__(self, *, x, y):
self.x = x
self.y = y
def __str__(self):
return str(tuple((getattr(self, i) for i in vars(self))))
def norm(self):
return (sum(val ** 2 for val in vars(self).values())) ** 0.5
class R3Vector(R2Vector):
def __init__(self, *, x, y, z):
super().__init__(x=x, y=y)
# User Editable Region
self.z = z
v1 = R2Vector(x=2, y=3)
v2 = R3Vector(x=2, y=2, z=3)
print(f'v1 = {v1.__str__()}')
print(f'v2 = {v2.__str__()}')
# User Editable Region
```

### Your browser information:

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### Challenge Information:

Learn Special Methods by Building a Vector Space - Step 26