熊猫：从行获取日期时间索引值

Question

I have a dataframe with datetime type column set to index. I want to process the data per row with apply function. how can I access the index value of the current row?

                      hid      lat        lon  
2016-08-11 10:56:00  549  40.639504 -79.996961   
2016-08-11 10:57:00  639  40.539504 -79.993981   
2016-08-11 10:58:00  749  40.438842 -79.924733 

def f(row):
    # I want to access row idx value here

df['new'] = df.apply(lambda row: f(row), axis=1)

Answer 1

由于apply将返回一个Series，因此您可以调用该Series的名称，该名称表示具有以下内容的索引：

df['new'] = df.apply(lambda row: row.name, axis=1)