ptymini fills the gap between ptyprocess (a raw pty fd), pexpect (sync expect loops), and terminado (a pty server welded to tornado): asyncio-native pty sessions. A PtySession is one spawned pty that any number of clients can attach to as independent byte streams, each primed from a byte-bounded replay buffer — so a reconnecting client resumes with recent scrollback instead of a blank screen.
A PtyRegistry adds named get-or-create sessions, injected shell setup (rc), and inactivity culling. It carries no server, no framework, and no session persistence beyond the process. Web exposure belongs to the embedding app (e.g. jupygate), and durable session management belongs to tmux.
$ pip install ptymini