How to use the pyopencga.rest_clients.file_client.Files function in pyopencga

self.samples = None
        self.cohorts = None
        self.families = None
        self.jobs = None
        self.individuals = None
        self.clinical = None
        self.alignment = None
        self.variant = None
        self.ga4gh = None
        self.meta = None

        ## [TODO] convert to @properties
        self.users = Users(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.projects = Projects(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.studies = Studies(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.files = Files(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.samples = Samples(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.cohorts = Cohorts(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.families = Families(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.jobs = Jobs(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.individuals = Individuals(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.clinical = Clinical(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.alignment = Alignment(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.variant = Variant(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.ga4gh = GA4GH(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.meta = Meta(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.admin = Admin(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.panels = Panels(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)
        self.tool = Tool(self.configuration, self.session_id, self._login_handler, auto_refresh=self.auto_refresh)

        self.clients = [self.users, self.projects, self.studies, self.files,
                        self.samples, self.cohorts, self.families, self.jobs,