LATEX expects documents to be arranged in a conventional,
hierarchical way, with chapters, sections, sub-sections,
appendixes, and the like. These are marked using macros rather
than environments, probably because the end of a section can be
safely inferred when a section of equal or higher level starts.
There are six ``levels'' of sectioning in the document classes
used for Python documentation, and the deepest two
levels1 are not used. The levels are:
Level
Macro Name
Notes
1
\chapter
(1)
2
\section
3
\subsection
4
\subsubsection
5
\paragraph
(2)
6
\subparagraph
Notes:
(1)
Only used for the manual documents, as described in
section 5, ``Document Classes.''
(2)
Not the same as a paragraph of text; nobody seems to use this.