How to remove levels from a multi-indexed dataframe?

Question

For example, I have:

In [1]: df = pd.DataFrame([8, 9],
                          index=pd.MultiIndex.from_tuples([(1, 1, 1),
                                         


        

Answer 1

df.reset_index(level=2, drop=True)
Out[29]: 
     A
1 1  8
  3  9

Answer 2

You don't need to create a new DataFrame instance! You can modify the index:

df.index = df.index.droplevel(2)
df

     A
1 1  8
  3  9

You can also specify negative indices, for selection from the end:

df.index = df.index.droplevel(-1)

Answer 3

If your index has names like

       A
X Y Z
1 1 1  8
  3 2  9

Then you can also remove by specifying the index name

df.index = df.index.droplevel(Z)