摘要: 首先定义一个数据表: a = pd.DataFrame({'name':['Tom','Amy','John','George'], 'sex':['male','female',np.nan,'male'], 'number':['SA1001','SA1002','SA1003','SA1004 阅读全文
posted @ 2020-11-19 22:35 爱吃砂糖橘的白龙 阅读(18146) 评论(0) 推荐(3) 编辑