In my opnion, for add a new data structure or algorithm for public, the final interception is reserved by czgdp1807.

First step is append the class or function in the beginning array __all__ of the file. Like:

__all__ = [
    'MAryTree',
    'ParentPointerTree'
]

Secondly, add the API in the module's __init__.py file. Like

from .m_ary_trees import (
    MAryTreeNode, MAryTree,
    ParentPointerTreeNode, ParentPointerTree
)

For ParentPointerTreeNode, you can check the above steps.

Three, after above two steps, you can import ParentPointerTree by

from pydatastructs import MAryTree, ParentPointerTree

Lastly, update your new datastructure in docs.

Yea, points 1, 2, and 4 are valid. I had forgotten to add them.

As for point 3, I was following the importing style in the other files. In the other files, they important it differently. For example,

from pydatastructs.linear_data_structures.arrays import ArrayForTrees

However, The points are nice regardless thanks :)