如何访问pandas数据帧的左上角单元格？

Question

这是我的Python的Pandas数据帧.如何访问左上角的单元格"gender"并更改文本？"gender"不在names.columns.所以我认为这可能是,names.index.name但那不是它.

import pandas as pd

names = pd.DataFrame({'births': {0: 7065, 1: 2604, 2: 2003, 3: 1939, 4: 1746},
 'gender': {0: 'F', 1: 'M', 2: 'F', 3: 'M', 4: 'F'},
 'name': {0: 'mary', 1: 'anna', 2: 'emma', 3: 'elizabeth', 4: 'minnie'},
 'year': {0: 1880, 1: 1880, 2: 1880, 3: 1880, 4: 1880}})

names = names.pivot_table(index=['name', 'year'], columns='gender', values='births').reset_index()

Answer 1

gender 是列索引的名称:

In [16]:
names.columns.name = 'something'
names

Out[16]:
something       name  year     F     M
0               anna  1880   NaN  2604
1          elizabeth  1880   NaN  1939
2               emma  1880  2003   NaN
3               mary  1880  7065   NaN
4             minnie  1880  1746   NaN

当你看到这个.columns对象时,你可以看到这个:

In [18]:
names.columns

Out[18]:
Index(['name', 'year', 'F', 'M'], dtype='object', name='gender')

我猜它确实看起来像输出中的索引