По инструкции можно запустить, но при переключении даты на 20201008 возникает ошибка.
TypeError Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_26276/720316058.py in
----> 1 ry_smbl_df = ak.get_roll_yield_bar(type_method="symbol", var="RB", date="20201008", plot=True)
2 ry_smbl_df
c:\users\zhuj\pycharmprojects\akshareproj\venv\lib\site-packages\akshare\futures\futures_roll_yield.py in get_roll_yield_bar(type_method, var, date, start_day, end_day, plot)
79 if type_method == "symbol":
80 df = get_futures_daily(start_date=date, end_date=date, market=symbol_market(var))
---> 81 df = df[df["variety"] == var]
82 if plot:
83 _plot_bar_2(df[["symbol", "close"]])
TypeError: 'NoneType' object is not subscriptable