Set Every Second Row's Index To One New Value

What is a simple and direct way to set the index of every second row of my dataframe to, say, ''? The method I used to use, df.loc[1::2, 'index'] = '' used to work but no longer do

Solution 1:

One way,

df = df.set_axis(pd.Index([index if i not in range(1, df.shape[0], 2) else''for i, index in enumerate(df.index)], 
                          name=df.index.name))
print(df)

Output

          foo
bar          
0    0.302340
     0.744609
2    0.489255
     0.542356
4    0.072797
     0.810690
6    0.738350
     0.939177
8    0.827072
     0.751731

We could also use DataFrame.Index.values but we need remove RangeIndex. So the cleanest way is DataFrame.rename

df = df.rename(index=dict.fromkeys(df.index[1::2],''))