获取两市停复牌数据，某些日期会出现数据解析出错 about akshare

[albertandking]

================ 2020-06-24
Traceback (most recent call last):
File "h:/project/stock/new/src/data/collect/stock_out_date.py", line 47, in
stock_em_tfp_df = ak.stock_em_tfp(trade_date=day_str)
File "C:\Users\lees\AppData\Roaming\Python\Python37\site-packages\akshare\stock_feature\stock_em_tfp.py", line 38, in stock_em_tfp
temp_df = pd.DataFrame(data_json["data"]).iloc[:, 0].str.split(",", expand=True)
File "D:\ProgramData\Anaconda3\lib\site-packages\pandas\core\generic.py", line 5270, in getattr
return object.getattribute(self, name)
File "D:\ProgramData\Anaconda3\lib\site-packages\pandas\core\accessor.py", line 187, in get
accessor_obj = self._accessor(obj)
File "D:\ProgramData\Anaconda3\lib\site-packages\pandas\core\strings.py", line 2041, in init
self._inferred_dtype = self._validate(data)
File "D:\ProgramData\Anaconda3\lib\site-packages\pandas\core\strings.py", line 2098, in _validate
raise AttributeError("Can only use .str accessor with string values!")
AttributeError: Can only use .str accessor with string values!

获取2020-06-24这天的数据出错

经测试，可以正常获取 2020-06-24，建议升级 pandas 到最新版