我想增加一个数据帧的单元格:
from pandas import DataFrame
foo = DataFrame([[1,'a'],[2,'b'],[3,'c']],columns=['a','z'])
foo.ix[0,['a']] += 1
这给出了以下错误:
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-141-cf9b905bd544> in <module>()
1 foo = DataFrame([[1,'a'],[2,'b'],[3,'c']],columns=['a','z'])
----> 2 foo.ix[0,['a']] += 1
/home/ubuntu/anaconda/lib/python2.7/site-packages/pandas/core/indexing.pyc in __setitem__(self, key, value)
86 indexer = self._convert_to_indexer(key)
87
---> 88 self._setitem_with_indexer(indexer, value)
89
90 def _has_valid_tuple(self, key):
/home/ubuntu/anaconda/lib/python2.7/site-packages/pandas/core/indexing.pyc in _setitem_with_indexer(self, indexer, value)
156 # we have an equal len list/ndarray
157 elif len(labels) == 1 and (
--> 158 len(self.obj[labels[0]]) == len(value) or len(plane_indexer[0]) == len(value)):
159 …