curriculum/challenges/english/blocks/learn-special-methods-by-building-a-vector-space/6668374ed18b7fce10259cb3.md
Now that you have an idea of how the attribute access work, remove the last two lines of your code together with the __getattr__ method.
Then, restore the print() calls you commented out before and delete the second argument from both of them.
You should not have a __getattr__ method.
({ test: () => assert.isFalse(runPython(`_Node(_code).find_class("R2Vector").has_function("__getattr__")`)) })
You should not have print(v1.z)and print(getattr(v1, 'z')) in your code.
({ test: () => assert.isFalse(runPython(`
n = _Node(_code)
n.has_call("print(v1.z)") or n.has_call("print(getattr(v1, 'z'))")
`)) })
You should restore the print() calls you commented out before and remove the second argument from both of them.
({ test: () => assert(runPython(`
_Node(_code).has_call("print(f'v1 = {v1}')") and _Node(_code).has_call("print(f'v2 = {v2}')")
`)) })
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})'
--fcc-editable-region--
def __getattr__(self, attr):
return 'calling __getattr__'
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(f'v1 = {v1}', f'\nrepr = {repr(v1)}')
# print(f'v2 = {v2}', f'\nrepr = {repr(v2)}')
print(v1.z)
print(getattr(v1, 'z'))
--fcc-editable-region--