def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def _Create(self):
    """Create the log group."""
    create_cmd = util.AWS_PREFIX + [
        '--region', self.region,
        'logs', 'create-log-group',
        '--log-group-name', self.name
    ]
    vm_util.IssueCommand(create_cmd)