for filename in oslistdirfolder_path if rematchfile_format filename date_str = filename1119 file_path = ospathjoinfolder_path filename yb_data = pdread_csvfile_path dtype=objec

The code is not able to match any data because the condition yb_data['发验机构'] == '苏州' and yb_data['发验机构'] == yb_data['验达机构'] cannot be satisfied at the same time. It seems like there is an issue with the logic of the condition. You should check the values in the '发验机构' and '验达机构' columns to see if they match the condition you are trying to impose.