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curriculum/challenges/english/blocks/learn-special-methods-by-building-a-vector-space/6659875502b6d7765498f324.md

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--description--

Use f-strings to modify your print calls so that they result in the output v1 = (2, 3) and v2 = (2, 2, 3), respectively.

--hints--

You should use an f-string to interpolate v1 and generate the output v1 = (2, 3).

js
({ test: () => assert(runPython(`_Node(_code).has_call("print(f'v1 = {v1}')")`)) })

You should use an f-string to interpolate v2 and generate the output v2 = (2, 2, 3).

js
({ test: () => assert(runPython(`_Node(_code).has_call("print(f'v2 = {v2}')")`)) })

--seed--

--seed-contents--

py

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