How to use the yfinance.shared._DFS function in yfinance

data = _requests.get(url=url, params=params, proxies=proxy)
        if "Will be right back" in data.text:
            raise RuntimeError("*** YAHOO! FINANCE IS CURRENTLY DOWN! ***\n"
                               "Our engineers are working quickly to resolve "
                               "the issue. Thank you for your patience.")
        data = data.json()

        # Work with errors
        debug_mode = True
        if "debug" in kwargs and isinstance(kwargs["debug"], bool):
            debug_mode = kwargs["debug"]

        err_msg = "No data found for this date range, symbol may be delisted"
        if "chart" in data and data["chart"]["error"]:
            err_msg = data["chart"]["error"]["description"]
            shared._DFS[self.ticker] = utils.empty_df()
            shared._ERRORS[self.ticker] = err_msg
            if "many" not in kwargs and debug_mode:
                print('- %s: %s' % (self.ticker, err_msg))
            return shared._DFS[self.ticker]

        elif "chart" not in data or data["chart"]["result"] is None or \
                not data["chart"]["result"]:
            shared._DFS[self.ticker] = utils.empty_df()
            shared._ERRORS[self.ticker] = err_msg
            if "many" not in kwargs and debug_mode:
                print('- %s: %s' % (self.ticker, err_msg))
            return shared._DFS[self.ticker]

        # parse quotes
        try:
            quotes = utils.parse_quotes(data["chart"]["result"][0], tz)