nsepy get_history 正在返回一个空数据框。这可能是什么原因？我在用version 0.7(latest version)
from datetime import date,timedelta
from nsepy import *
end_day = date.today()
start_day = end_day - timedelta(2)
stock_price_df = get_history(symbol="SBIN", start= date.today() - timedelta(2), end= date.today())