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fillna with index

In [13]:
d=pd.DataFrame(index=['A','B','C'], columns=['Num','Name'], data=[[1,'Andrew'], [2, np.nan], [3, 'Chris']])
d['Name']=d['Name'].fillna(d.index.to_series())
d

Out[13]:
   Num    Name
A    1  Andrew
B    2       B
C    3   Chris

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