Learn Special Methods by Building a Vector Space - Step 8

Python
1

Tell us what’s happening:

I am following the instructions, the value is displayed, but the error is:

  1. You should call norm() on v1 and print the result.
    Which am doing, but still doesn’t pass.
    What am I missing?
    Please review your instructions, as the may be wrong with the answer.

Your code so far


# User Editable Region

class Vector:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        
    def norm(self):
        return (self.x**2 + self.y**2)**0.5

v1 = Vector(2, 3)
print(Vector.norm(v1))

# User Editable Region

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Challenge Information:

Learn Special Methods by Building a Vector Space - Step 8

2

you are not calling norm on v1, you are calling it on Vector

3

The right value is printed, but using different syntax.

For example:

class A:
    def method(self):
        print("a")

a = A()

To call method, there are at least two ways. self in the signature of the method is an instance of the class. When calling it via class, the instance needs to be passed explicitly:

A.method(a)  # a

However, when calling it via instance:

a.method()  # a

The instance will be automatically passed as first argument.

While both will result in the same, the calling methods via instance is preferred.

4

and it’s the one expected by the tests in this step

5

So I swap v1 & Vector?

6

So I swap Vector & v1?

7

no, swapping would not be the right thing to do, but you need to use norm on v1