dal.py 文件源码

def _reader(self):
        if not self.does_exist():
            return
        dateparse = lambda dates: pd.datetime.strptime(dates, '%Y-%m-%d %H:%M:%S.%f')
        df = pd.read_csv(self.data_file, parse_dates='timestamp', index_col='timestamp', date_parser=dateparse)
        return df