def load(self, filename, create_if_missing=True):
        filename = Path(filename)
        if not filename.exists() and create_if_missing:
            self.load_pip_requirements()
            with filename.open("w") as f:
                f.write(yaml.dump(self.serialized, default_flow_style=False,
                                  encoding=None))
            self.filename = filename
            return self.save(filename)
        with filename.open() as f:
            for group, requirements in yaml.load(f.read()).items():
                for requirement in requirements:
                    self[group].add(Requirement.coerce(requirement))
        self.filename = filename
def _PostCreate(self):
    """Set the retention policy."""
    put_cmd = util.AWS_PREFIX + [
        '--region', self.region,
        'logs', 'put-retention-policy',
        '--log-group-name', self.name,
        '--retention-in-days', str(self.retention_in_days)
    ]
    vm_util.IssueCommand(put_cmd)