Launch a subprocess in a pseudo terminal (pty), and interact with both theprocess and its pty.

Sometimes, piping stdin and stdout is not enough. There might be a passwordprompt that doesn't read from stdin, output that changes when it's going to apipe rather than a terminal, or curses-style interfaces that rely on a terminal.If you need to automate these things, running the process in a pseudo terminal(pty) is the answer.

Interface:

fromptyprocessimportPtyProcessUnicodep=PtyProcessUnicode.spawn(['python'])p.read(20)p.write('6+6\n')p.read(20)