trying ways to create random trees

rtree.py

import random

class Node:
    def __init__(self, v, l=None, r=None):
        assert v is not None, "can't create a node with value = None"
        self.v = v
        self.l = l
        self.r = r

    def __repr__(self):
        rl = repr(self.l)
        rr = repr(self.r)
        if self.l or self.r:
            return f'Node({self.v}\n\tl:{rl},\n\tr:{rr})'
        else:
            return f'Leaf({self.v})'

class RTree:

    def __init__(self, root):
        self.root = root
        self.boundary = set([root])

    def rebound(self, parent, child):
        """
        Adds a new child in the boundary,
        Remove parent if it has left and right node.
        """
        self.boundary.add(child)
        if parent.l and parent.r:
            self.boundary.remove(parent)

    def insert(self, value):
        parent = random.choice(list(self.boundary))
        insert_left = random.choice([True, False])
        child = Node(value)
        if insert_left:
            parent.l = node
        else:
            parent.r = node
        self.rebound(parent, child)

    def __repr__(self):
        return f'<RTree\n\tboundary:{self.boundary}\n\n\ttree:{self.root}>'

def test0(count=4):
    t = RTree(Node(1))
    for i in range(count): t.insert(i)
    return t