I would like to remove the extra index called service\_type\_id that I have not included in my code but it just appear without any reason. I am using Python.

My code is

```
data_tr = data.groupby(['transaction_id', 'service_type']).sum().unstack().reset_index().fillna(0).set_index('transaction_id')

```

The output is this table with extra index:
[![enter image description here](https://i.stack.imgur.com/kfZEI.jpg)](https://i.stack.imgur.com/kfZEI.jpg)

I believe it is something to do with the groupby and unstack. Kindly highlight to me why there will be extra index and what should be my code be.

The dataset
<https://drive.google.com/file/d/1XZVfXbgpV0l3Oewgh09Vw5lVCchK0SEh/view?usp=sharing>