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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_output(script, expanded):
 """Get output of the script. :param script: Console script. :type script: str :param expanded: Console script with expanded aliases. :type expanded: str :rtype: str """

    if shell_logger.is_available():
        return shell_logger.get_output(script)
    if settings.instant_mode:
        return read_log.get_output(script)
    else:
        return rerun.get_output(script, expanded)