subprocess32 Backport for Python 2

subprocess32 is a backport of the `subprocess` standard library module from Python 3 (specifically APIs from versions 3.2 through 3.5) for use on Python 2.x. It includes critical bugfixes, notably for reliability in threaded applications on POSIX systems, and new features like timeout support (from Python 3.3) and the `run()` API (from Python 3.5). The latest version is 3.5.4, released in May 2019. The project is explicitly end-of-life (EOL) as Python 2 itself has reached EOL, meaning there are no further active developments or planned releases.