Question: what is causing the error and how can I remove it. error:Cannot assign member left for type Node Expression of type Node cannot be assigned

what is causing the error and how can I remove it.

error:Cannot assign member "left" for type "Node" Expression of type "Node" cannot be assigned to member "left" of class "Node" Type cannot be assigned to type "None"

code:

class Node(object):

def __init__(self,value):

self.left = None

self.right = None

self.value = value

class binary_tree(object):

def __init__(self,root):

self.root = Node(root)

my_tree = binary_tree(10)

my_tree.root.left = Node(12)

my_tree.root.right = Node(8)

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