我有以下数据框:
> df1
id begin conditional confidence discoveryTechnique
0 278 56 false 0.0 1
1 421 18 false 0.0 1
> df2
concept
0 A
1 B
我应该如何将索引合并以获得以下结果: id begin conditional confidence discoveryTechnique concept
0 278 56 false 0.0 1 A
1 421 18 false 0.0 1 B
我问这个问题是因为我理解merge()
,也就是df1.merge(df2)
使用列来进行匹配。实际上,我这样做得到的结果是:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/pandas/core/frame.py", line 4618, in merge
copy=copy, indicator=indicator)
File "/usr/local/lib/python2.7/dist-packages/pandas/tools/merge.py", line 58, in merge
copy=copy, indicator=indicator)
File "/usr/local/lib/python2.7/dist-packages/pandas/tools/merge.py", line 491, in __init__
self._validate_specification()
File "/usr/local/lib/python2.7/dist-packages/pandas/tools/merge.py", line 812, in _validate_specification
raise MergeError('No common columns to perform merge on')
pandas.tools.merge.MergeError: No common columns to perform merge on
在索引上进行合并是不好的实践吗?这是不可能的吗?如果是这样,我该如何将索引移动到一个名为"index"的新列中?
df1.join(df2)
,意思是将两个数据框按照它们的索引(index)进行合并。 - MaxU - stand with Ukraine