bpo-34605, pty: Avoid master/slave terms by vstinner · Pull Request #9100 · python/cpython

* pty.spawn(): rename master_read parameter to parent_read
* Rename pty.slave_open() to pty.child_open(), but keep an
  pty.slave_open alis to pty.child_open for backward compatibility
* os.openpty(), os.forkpty(): rename master_fd/slave_fd
  to parent_fd/child_fd
* Rename internal variables:

  * Rename master_fd/slave_fd to parent_fd/child_fd
  * Rename slave_name to child_name