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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 main(self):
 """ This is the main entry point of the ElastiCluster CLI. First the central configuration is created, which can be altered through the command line interface. Then the given command from the command line interface is called. """

        assert self.params.func, "No subcommand defined in `ElastiCluster.main()"
        try:
            return self.params.func()
        except Exception as err:
            log.error("Error: %s", err)
            if self.params.verbose > 2:
                import traceback
                traceback.print_exc()
            print("Aborting because of errors: {err}.".format(err=err))
            sys.exit(1)