Tell us what’s happening:
Declare a variable args and assign it the value returned by joining the elements in arg_list with the string ‘, ‘.
def repr(self):
arg_list = [f’{key}={val}’ for key, val in vars(self).items()]
args=“,”.join(arg_list)
I may not understand the instructions but args=“,”.join(arg_list) is a join of the arglist and returns x=2,y=3
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)))
# User Editable Region
def __repr__(self):
arg_list = [f'{key}={val}' for key, val in vars(self).items()]
args=",".join(arg_list)
return args
# 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 = R3Vector(x=2, y=2, z=3)
print(f'v1* = {v1.__repr__()}')
print(f'v2 = {v2}')
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Challenge Information:
Learn Special Methods by Building a Vector Space - Step 29