Pandas: 0 या NaN मानों पर काम करते समय फ्रेम _apply_standard त्रुटि

यहां मैंने जिन चरणों का पालन किया है। मैं पांडा (0.12.0) का उपयोग कर रहा हूँ।

In [1]: import pandas as pd
In [4]: dataFrame = pd.read_csv('./test.csv')
In [7]: dataFrame
Out[7]:
    r1   r2  r3  r4  r5
0  NaN  3.5 NaN NaN   5
1  4.5  NaN   4 NaN NaN
2  1.5  NaN NaN NaN NaN
3  NaN  NaN NaN NaN NaN
4  NaN  NaN NaN NaN NaN
5  4.5  NaN   4 NaN NaN
6  NaN  NaN NaN NaN NaN

In [8]: dataFrame['mean'] = dataFrame.mean(axis=1)
In [9]: dataFrame
Out[9]:
    r1   r2  r3  r4  r5  mean
0  NaN  3.5 NaN NaN   5  4.25
1  4.5  NaN   4 NaN NaN  4.25
2  1.5  NaN NaN NaN NaN  1.50
3  NaN  NaN NaN NaN NaN   NaN
4  NaN  NaN NaN NaN NaN   NaN
5  4.5  NaN   4 NaN NaN  4.25
6  NaN  NaN NaN NaN NaN   NaN
In [10]: dataFrame.dtypes
Out[10]:
r1      float64
r2      float64
r3      float64
r4      float64
r5      float64
mean    float64
dtype: object

In [11]: meanCenteredDataFrame = dataFrame.apply(lambda x: x -x['mean'])
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-11-e6cc746e933b> in <module>()
----> 1 meanCenteredDataFrame = dataFrame.apply(lambda x: x -x['mean'])

//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in apply(self, func, axis, broadcast, raw, args, **kwds)
   4414                     return self._apply_raw(f, axis)
   4415                 else:
-> 4416                     return self._apply_standard(f, axis)
   4417             else:
   4418                 return self._apply_broadcast(f, axis)

//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in _apply_standard(self, func, axis, ignore_failures)
   4489                     # no k defined yet
   4490                     pass
-> 4491                 raise e
   4492
   4493

KeyError: ('mean', u'occurred at index r1')

In [12]: dataFrame.fillna(0,inplace=True)

In [13]: meanCenteredDataFrame = dataFrame.apply(lambda x: x -x['mean'])
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-13-e6cc746e933b> in <module>()
----> 1 meanCenteredDataFrame = dataFrame.apply(lambda x: x -x['mean'])

Type:       DataFrame
String Form:
r1   r2  r3  r4  r5  mean
           0  0.0  3.5   0   0   5  4.25
//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in apply(self, func, axis, broadcast, raw, args, **kwds)
   4414                     return self._apply_raw(f, axis)
   4415                 else:
-> 4416                     return self._apply_standard(f, axis)
   4417             else:
   4418                 return self._apply_broadcast(f, axis)

//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in _apply_standard(self, func, axis, ignore_failures)
   4489                     # no k defined yet
   4490                     pass
-> 4491                 raise e
   4492
   4493

KeyError: ('mean', u'occurred at index r1')