def run_command(self, command, timeout=-1):
        """Send a command to the REPL, wait for and return output.

        :param str command: The command to send. Trailing newlines are not needed.
          This should be a complete block of input that will trigger execution;
          if a continuation prompt is found after sending input, :exc:`ValueError`
          will be raised.
        :param int timeout: How long to wait for the next prompt. -1 means the
          default from the :class:`pexpect.spawn` object (default 30 seconds).
          None means to wait indefinitely.
        """
        # Split up multiline commands and feed them in bit-by-bit
        cmdlines = command.splitlines()
        # splitlines ignores trailing newlines - add it back in manually
        if command.endswith('\n'):
            cmdlines.append('')
        if not cmdlines:
            raise ValueError("No command was given")

        res = []
        self.child.sendline(cmdlines[0])
        for line in cmdlines[1:]:
            self._expect_prompt(timeout=timeout)
            res.append(self.child.before)
            self.child.sendline(line)

        # Command was fully submitted, now wait for the next prompt
        if self._expect_prompt(timeout=timeout) == 1:
            # We got the continuation prompt - command was incomplete
            self.child.kill(signal.SIGINT)
            self._expect_prompt(timeout=1)
            raise ValueError("Continuation prompt found - input was incomplete:\n"
                             + command)
        return u''.join(res + [self.child.before])
Send a command to the REPL, wait for and return output.

        :param str command: The command to send. Trailing newlines are not needed.
          This should be a complete block of input that will trigger execution;
          if a continuation prompt is found after sending input, :exc:`ValueError`
          will be raised.
        :param int timeout: How long to wait for the next prompt. -1 means the
          default from the :class:`pexpect.spawn` object (default 30 seconds).
          None means to wait indefinitely.