def __init__(self, server, username, command):
        """
        @param server: The address of the SSH server on which the command is
            running.
        @type server: L{IAddress} provider

        @param username: An authentication username which was used to
            authenticate against the server at the given address.
        @type username: L{bytes}

        @param command: A command which was run in a session channel on the
            server at the given address.
        @type command: L{bytes}
        """
        self.server = server
        self.username = username
        self.command = command

        @param server: The address of the SSH server on which the command is
            running.
        @type server: L{IAddress} provider

        @param username: An authentication username which was used to
            authenticate against the server at the given address.
        @type username: L{bytes}

        @param command: A command which was run in a session channel on the
            server at the given address.
        @type command: L{bytes}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/endpoints.py