我有一个如下所示的排序请求。
我需要reset_index(),然后sort(),再set_index()吗?还是有更好的方法来做到这一点呢?
l = [[1,'A',99],[1,'B',102],[1,'C',105],[1,'D',97],[2,'A',19],[2,'B',14],[2,'C',10],[2,'D',17]]
df = pd.DataFrame(l,columns = ['idx1','idx2','col1'])
df.set_index(['idx1','idx2'],inplace=True)
# assume data has been received like this...
print df
col1
idx1 idx2
1 A 99
B 102
C 105
D 97
2 A 19
B 14
C 10
D 17
# I'd like to sort descending on col1, partitioning within index level = 'idx2'
col1
idx1 idx2
1 C 105
B 102
A 99
D 97
2 A 19
D 17
B 14
C 10
谢谢您的回答。
请注意,我稍微更改了数据:l = [[1,'A',99],[1,'B',11],[1,'C',105],[1,'D',97],[2,'A',19],[2,'B',14],[2,'C',10],[2,'D',17]]
df = pd.DataFrame(l,columns = ['idx1','idx2','col1'])
df.set_index(['idx1','idx2'],inplace=True)
df = df.sort_index(by='col1', ascending=False)
然而输出结果为
idx1 idx2
1 C 105
A 99
D 97
2 A 19
D 17
B 14
1 B 11
2 C 10
我本来希望它是这样的。
idx1 idx2
1 C 105
A 99
D 97
B 11
2 A 19
D 17
B 14
C 10