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Launch a subprocess in a pseudo terminal (pty), and interact with
both the process and its pty.
Sometimes, piping stdin and stdout is not enough. There might be
a password prompt that doesn't read from stdin, output that changes
when it's going to a pipe 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.
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