Any code in this directory is not officially supported, and may change or be removed at any time without notice.
The contrib/ directory contains external contributions to YAPF, which aren‘t part of its official code base. In particular, lib2to3 “fixers” are added here. They aren’t part of YAPF, because they modify non-whitespace in source code, which is against the YAPF philosophy.
The code in this directory may not be tested on a regular basis, and thus should be used with caution.