





import warnings
from functools import wraps
from typing import Callable


def     SCREAMING_SNAKE_CASE			(      lowerCAmelCase					):

       @wraps(UpperCamelCase__					)
       def _inner_fn(*lowerCAmelCase    ,       **lowerCAmelCase					):
              warnings.warn(
                  (f'''\'{fn.__name__}\' is experimental and might be subject to breaking changes in the future.''')    ,       UpperCamelCase__    ,       )
              return fn(*UpperCamelCase__    ,       **UpperCamelCase__					)

       return _inner_fn













from __future__ import annotations

from collections.abc import Iterator

class  __A:

     def __init__(      self,       A      ):





            """simple docstring"""

            _UpperCamelCase              =						value
            _UpperCamelCase              =						None
            _UpperCamelCase              =						None






class  __A:

     def __init__(      self,       A      ):





            """simple docstring"""

            _UpperCamelCase              =						tree

     def 	_UpperCamelCase     (      self,       A      ):





            """simple docstring"""

            if node is None:
                   return 0
            return node.value + (
                self.depth_first_search(node.left      ) + self.depth_first_search(node.right      )
            )



     def __iter__(      self      ):





            """simple docstring"""

            yield self.depth_first_search(self.tree      )


if __name__ == "__main__":
       import doctest

       doctest.testmod()






