Learn Special Methods by Building a Vector Space - Step 59

Tell us what’s happening:

I’m stuck on this step so far and this is the solution I reached to. Checked all over the internet and got same solution and also from ChatGPT was the same solution, can you please help me know what is wrong with my code

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 vars(self).values())**0.5

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

    def __repr__(self):
        arg_list = [f'{key}={val}' for key, val in vars(self).items()]
        args = ', '.join(arg_list)
        return f'{self.__class__.__name__}({args})'

    def __add__(self, other):
        if type(self) != type(other):
            return NotImplemented
        kwargs = {i: getattr(self, i) + getattr(other, i) for i in vars(self)}
        return self.__class__(**kwargs)

    def __sub__(self, other):
        if type(self) != type(other):
            return NotImplemented
        kwargs = {i: getattr(self, i) - getattr(other, i) for i in vars(self)}
        return self.__class__(**kwargs)

    def __mul__(self, other):
        if type(other) in (int, float):
            kwargs = {i: getattr(self, i) * other for i in vars(self)}
            return self.__class__(**kwargs)        
        elif type(self) == type(other):
            args = [getattr(self, i) * getattr(other, i) for i in vars(self)]
            return sum(args)            
        return NotImplemented

# User Editable Region

    def __eq__(self, other):
        if not isinstance(self, other) in (self.__class__):
            return NotImplemented  

# User Editable Region

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 = R2Vector(x=0.5, y=1.25)
print(f'v1 = {v1}')
print(f'v2 = {v2}')
v3 = v1 + v2
print(f'v1 + v2 = {v3}')
v4 = v1 - v2
print(f'v1 - v2 = {v4}')
v5 = v1 * v2
print(f'v1 * v2 = {v5}')

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Challenge Information:

Learn Special Methods by Building a Vector Space - Step 59

Firstly, do not use ChatGPT as a source of answers. It will lie to you with the confidence of a politician.

Secondly, for this step it wants you to compare the type of both self and other and confirm they are not the same.

More about the type function here: Glossary — Python 3.13.1 documentation

Though I do see the potential value in isinstance. Built-in Functions — Python 3.13.1 documentation

1 Like

Thank you, I don’t know how didn’t I notice that. Appreciate the assistance