在Pandas Groupby中创建索引

Question

When I use groupby on a pandas dataframe, an index is automatically created by the column I used for grouping. If I want to use that column later, I can do something like:

df['index1'] = df.index

Is there a way, I can use groupby and not create the index? Specifying as_index=False does not work.

Answer 1

Specify as_index=False in the groupby call. See the groupby docstring .

(although it will depend on the exact operation you do on the groupby object afterwards if this will have effect or not).