class Treenode:
def __init__( self, data ):
self._left = None
self._data = data
self._right = None
def __str__( self ):
return str( self._data )
class Tree:
def __init__( self ):
self._rootNode = None
def insertNode( self, value ):
if self._rootNode is None:
self._rootNode = Treenode( value )
else:
self.insertNodeHelper( self._rootNode, value )
def insertNodeHelper( self, node, value ):
if value < node._data:
if node._left is None:
node._left = Treenode( value )
else:
self.insertNodeHelper ( node._left, value )
elif value > node._data:
if node._right is None:
node._right = Treenode( value )
else:
self.insertNodeHelper( node._right, value )
else:
print value, "duplicate"
def preOrderTraversal( self ):
self.preOrderHelper( self._rootNode )
def preOrderHelper( self, node ):
if node is not None:
print node,
self.preOrderHelper( node._left )
self.preOrderHelper( node._right )
def inOrderTraversal( self ):
self.inOrderHelper( self._rootNode )
def inOrderHelper( self, node ):
if node is not None:
self.inOrderHelper( node._left )
print node,
self.inOrderHelper( node._right )
def postOrderTraversal( self ):
self.postOrderHelper( self._rootNode )
def postOrderHelper( self, node ):
if node is not None:
self.postOrderHelper( node._left )
self.postOrderHelper( node._right )
print node,
tree = Tree()
values = "1 2 3 4 5 6 7 8 9 0 10"
for i in values.split():
tree.insertNode( int( i ) )
tree.preOrderTraversal()
print
tree.inOrderTraversal()
print
tree.postOrderTraversal()
print