Colab setup

Hi,
newbie here - I have tried to use ipynb in google colab with no success... Here is my code:

```
!pip install ipynb --upgrade

from ipynb.fs.defs.testingnb import *
```

and in the same folder I have a testingnb.ipynb file. I get the error:

```
---------------------------------------------------------------------------
ModuleNotFoundError Traceback (most recent call last)

in ()
----> 1 import ipynb.fs.defs.testingnb

ModuleNotFoundError: No module named 'ipynb.fs.defs.testingnb'

```

Am i missing some setup step? thanks!
Luigi