openpyxl 读取多个excle中的数据并保存到List中

def excel_to_json(file_name):
    wb = load_workbook(file_name)
    all_data = defaultdict(list)
    for sheet_name in wb.sheetnames:
        rows = list(wb[sheet_name].rows)
        title = [i.value for i in rows[0]]
        for row in rows[1:]:
            data = [i.value for i in row]
            all_data[sheet_name].append(dict(zip(title, data)))
    return  all_data