# `none`

Python's null type, referred to when a null or "placeholder" is needed. It is in and of itself a singleton in any given interpreter session, so `None is None` is always considered True.

None is used in both [binary-search-tree][binary-search-tree] and [markdown][markdown].

TODO: ADD MORE DETAIL

See the Python [documentation entry][keyword-none-docs], as well as [this blog post][keyword-none-etymology] for more details.

[binary-search-tree]: ../../exercise-concepts/binary-search-tree.md
[markdown]: ../../exercise-concepts/markdown.md
[keyword-none-docs]: https://docs.python.org/3/library/stdtypes.html#the-null-object
[keyword-none-etymology]: https://yawpitchroll.com/posts/the-35-words-you-need-to-python/#none
