def cash_flow(self, ticker: str) -> str:
        """
        Return the cash flow of the stock.

        Args:
          ticker (str): the stock ticker to be given to yfinance

        """
        stock = yf.Ticker(ticker)
        cash_flow = pd.DataFrame(stock.cashflow)
        return "Cash Flow: \n" + cash_flow.to_string()

        Return the cash flow of the stock.

        Args:
          ticker (str): the stock ticker to be given to yfinance

        
llama-index-integrations/tools/llama-index-tools-yahoo-finance/llama_index/tools/yahoo_finance/base.py