导入需要的包

先引入后面可能用到的包（package）

import pandas as pd
import datetime
import jqdatasdk as jk # 导入聚宽包

stk_list = jk.get_all_securities(types=['stock'], date=None)
stk_list.reset_index(inplace=True) # 重建索引
stk_list.rename(columns={'index': 'stk_code', 'display_name': 'stk_name'}, inplace=True) # 修改列名
stk_list_n=list(stk_list["stk_code"])

运行后提示C:\Users\86136\PycharmProjects\pythonProject2\venv\Scripts\python.exe C:/Users/86136/PycharmProjects/pythonProject2/main.py
run jqdatasdk.auth first
Traceback (most recent call last):
File "C:\Users\86136\PycharmProjects\pythonProject2\main.py", line 10, in
stk_list.reset_index(inplace=True) # 重建索引
AttributeError: 'NoneType' object has no attribute 'reset_index'
怎么解决啊