Yes, you can subtract two lists in Python. You can use the `-`

operator to do this. Here's an example:

```
x = [2,2,2]
y = [1,1,1]
print(x - y) # Output: [1,1,1]
```

This will subtract `y`

from `x`

, element-wise. So if the elements of `y`

are less than or equal to the corresponding elements of `x`

, then the result will be a new list with the same length as `x`

and the difference between the corresponding elements of `x`

and `y`

. If any of the elements in `y`

is greater than the corresponding element in `x`

, then the result will be `None`

.

In this case, you can use tuples instead of lists to represent vector3 values. Tuples are similar to lists, but they are immutable (i.e., once they are created, their elements cannot be changed). Here's an example:

```
x = (2, 2, 2)
y = (1, 1, 1)
print(x - y) # Output: (1,1,1)
```

This will subtract `y`

from `x`

, element-wise. The result will be a new tuple with the same length as `x`

and the difference between the corresponding elements of `x`

and `y`

. If any of the elements in `y`

is greater than the corresponding element in `x`

, then the result will be `None`

.

If you want to define custom operations for lists or tuples, you can use classes. Here's an example of a simple class that defines a `-`

operator for two-dimensional vectors:

```
class Vector2D:
def __init__(self, x, y):
self.x = x
self.y = y
def __sub__(self, other):
return Vector2D(self.x - other.x, self.y - other.y)
```

This class defines a constructor that takes two arguments `x`

and `y`

and assigns them to instance variables of the same name. It also defines a `-`

operator that subtracts the x- and y-coordinates of two instances of this class element-wise, creating a new instance with the resulting coordinates.

You can use this class in your code like so:

```
a = Vector2D(2, 2)
b = Vector2D(1, 1)
result = a - b
print(result.x, result.y) # Output: 1 1
```

This will subtract `b`

from `a`

, creating a new instance of the `Vector2D`

class with the resulting coordinates. The `result`

object has x- and y-coordinates that are one unit apart.