### 告诉我们发生了什么：

```
def __mul__(self, other):
if isinstance(other, (int, float)):
kwargs = {i: getattr(self, i) * other for i in vars(self)}
return self.__class__(**kwargs)
else:
return NotImplemented
```

Your method should return a new instance of the current class only when the type of other is either int or float.

### 到目前为止你的代码

```
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)
# User Editable Region
def __mul__(self, other):
if isinstance(other, (int, float)):
kwargs = {i: getattr(self, i) * other for i in vars(self)}
return self.__class__(**kwargs)
else:
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}')
```

### 你的浏览器信息：

用户代理是： `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15`

### 挑战信息：

Learn Special Methods by Building a Vector Space - Step 52