重命名pandas数据帧列后,我面临一个错误:
B=pd.DataFrame(data=[[1,1,1],[2,2,2]],columns={'A','B','C'})
print(B.loc[0,'B'])
B = B.rename(index=str,columns={'B':'B_B'})
print(B.loc[0,'B_B'])
此代码导致以下输出:
> 1
>Traceback (most recent call last):
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 2881, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-29-6df9197203b9>", line 4, in <module>
print(B.loc[0,'B_B'])
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\indexing.py", line 1310, in __getitem__
return self._getitem_tuple(key)
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\indexing.py", line 796, in _getitem_tuple
return self._getitem_lowerdim(tup)
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\indexing.py", line 922, in _getitem_lowerdim
section = self._getitem_axis(key, axis=i)
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\indexing.py", line 1482, in _getitem_axis
self._has_valid_type(key, axis)
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\indexing.py", line 1409, in _has_valid_type
key = self._convert_scalar_indexer(key, axis)
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\core\indexing.py", line 196, in _convert_scalar_indexer
return ax._convert_scalar_indexer(key, kind=self.name)
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\indexes\base.py", line 1171, in _convert_scalar_indexer
return self._invalid_indexer('label', key)
File "C:\Users\FreieL01\AppData\Local\Continuum\Anaconda3\lib\site-packages\pandas\indexes\base.py", line 1284, in _invalid_indexer
kind=type(key)))
TypeError: cannot do label indexing on <class 'pandas.indexes.base.Index'> with these indexers [0] of <class 'int'>}
似乎重命名更改了datafframe对象的类型。。。
运行
df.rename(index=str, ...)
会将数据帧索引类型转换为字符串类型,因此它们是字符串。你可以打印出来确认这一点。因此,这是有效的:
如果不需要,在重命名
B
列时不要传递index
属性,如下所示:相关问题 更多 >
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