Wrapper to get the latest PyPI version (async)
        The data are stored in a cached file
        Only update online once a week

def get_pypi_version(self):
        """Wrapper to get the latest PyPI version (async)
        The data are stored in a cached file
        Only update online once a week
        """
        if self.args.disable_check_update:
            return

        # If the cached file exist, read-it
        cached_data = self._load_cache()

        if cached_data == {}:
            # Update needed
            # Update and save the cache
            thread = threading.Thread(target=self._update_pypi_version)
            thread.start()
        else:
            # Update not needed
            self.data['latest_version'] = cached_data['latest_version']
            logger.debug("Get Glances version from cache file")