I have 2 classes in my main.py and I want to create two more python files to put them in there.
I can't figure out how to import them from those files to my main file. Help!

Here are my classes in main.py:

```
class Node():
    def __init__(self, k):
        self.key = k
        self.p = None
        self.left = None
        self.right = None

class BST():
    def __init__(self, root=None):
        self.root = root

```

I was thinking to do something like that:

```
import Node
import BST

```

or

```
from "folderName" import Node
from "folderName" import BST

```

but it didn't work