$```$

fron Node$234$ import Node$234$

class Tree$234$Iterator:

def $\_\_$init$\_\_($self$,$ root$)$:

$*$ Your code here $($remove placeholder Line below$)$

self.node$\_$stack $=[]$

self.current$\_$node $=$ root

self.current$\_$key$\_$index $=0$

while self.current$\_$node is not None:

self.node$\_$stack.append$(($self$.$current$\_$node, self.current$\_$key$\_$index$))$

self.current$\_$node $=$ self.current$\_$node.get$\_$child$($self$.$current$\_$key$\_$index$)$

self.current$\_$key$\_$index $=0$ if self.current$\_$node is not None else e

$\backslash$l Returns the tree's next key, or raises StopIteration if no more keys exist

def $\_\_$next$\_\_($self$)$:

$*$ Your code here $($remove placeholder Line below$)$

if not self.node$\_$stack:

raise StopIteration

current$\_$node, current$\_$key$\_$index $=$ self.node$\_$stack.pop$()$

key $=$ current$\_$node.get$\_$key$($current$\_$key$\_$index$)$

self.current$\_$key$\_$index $+=1$

while current$\_$node.is$\_$internal$()$ and self.current$\_$key$\_$index $$ current$\_$node.get$\_$num$\_$key:

child $=$ current$\_$node.get$\_$child$($self$.$current$\_$key$\_$index$)$

self.node$\_$stack.append$(($current$\_$node, self.current$\_$key$\_$index$))$

current$\_$node $=$ child

self.current$\_$key$\_$index $=0$

return key

#def$\_\_$iter$\_\_($seLf$)$

$|$return self

$```$

inter program input $($optional$)$

fyour code requires input values, provide them here.

Run your program as often as you'd like, before submitting for grading. Below, type any needed input values in the first box, then click Run program and observe the program's output in the second box.

rogram errors displayed here

$```$

Traceback $($most recent call last$)$:

File $"/$home$/$runner$/$local$/$submission$/$main$.$py$",$ line $43,$ in

main$()$

File $"/$home$/$runner$/$local$/$submission$/$main$.$py$",$ line $27,$ in main

for actual$\_$int in tree:

File $"/$home$/$runner$/$local$/$submission$/$Tree$234$Iterator$-$py$",$ line $26,$ in $\_\_$next

while current$\_$node.is$\_$internal $()$ and self.current$\_$key$\_$index $$ current$\_$node.get$\_$num$\_$key:

AttributeError: 'Node$234\text{'}$ object has no attribute $\text{'}$is$\_$internal'

$```$