def load_pip_requirements(self, files_map=None, freeze=True):
        if files_map is None:
            files_map = self.default_pip_files
        for group, requirements_txt in files_map.items():
            path = Path(requirements_txt)
            if not path.exists() and group.lower() == "all" and freeze:
                cmd = envoy.run("pip freeze")
                self[group].loads(cmd.std_out)
            elif path.exists():
                self[group].load(path)
def _loadapp(self, proxy_config_path):
        """
        Load a proxy from an app.conf to get the memcache_ring

        :returns: the memcache_ring of the memcache middleware filter
        """
        with mock.patch('swift.proxy.server.Ring'):
            app = loadapp(proxy_config_path)
        memcache_ring = None
        while True:
            memcache_ring = getattr(app, 'memcache', None)
            if memcache_ring:
                break
            app = app.app
        return memcache_ring