如何批量对多个数据集中的列名加上前缀

dict_data = {'stores' : stores, 'rules': rules, 'm_sku': m_sku, 'mechanisms':mechanisms, 'plants': plants, 'activities': activities, 'sku': sku, 'brands':brands  }
for k, v in dict_data.items():
    v. rename(columns={x: (k+'_'+x)  for x in v.columns}, inplace = True)