pandas.core.frame.DataFrame 重命名索引问题

Question

In an existing table I got some summary by

df.groupby('bin_fare')['fare'].agg(['count', 'sum', 'mean'])

The result is table above. bin_fare name of Indexes

bin_fare count sum mean

1 491 3717.1413 7.570553

2 474 9000.3078 18.987991

3 259 14565.0003 14565.0003

4 84 16268.0375 16268.0375

I tried to rename indexes by adding this code

fare_rate_names = ['cheapest','avarage','above average','expensive']
df.groupby('bin_fare')['fare'].agg(['count','sum','mean']).rename(index=pd.Series(data=fare_rate_names))

But it renames only first 3 row !

bin_fare count sum mean

avarage 491 3717.1413 7.570553

above average 474 9000.3078 18.987991

expensive 259 14565.0003 14565.0003

4 84 16268.0375 16268.0375

How to fix it? Not adding element at the beginning of fare_rate_names

Answer 1

You can just set a new index:

df.index = pd.Series(fare_rate_names)

Or, you could create a dummy name for the 0th index:

fare_rate_names = ['foo', 'cheapest','avarage','above average','expensive']
df.groupby('bin_fare')['fare'].agg(['count','sum','mean']).rename(index=pd.Series(data=fare_rate_names))