Unable to import notebooks with names that start with a number

Create a notebook with a number as the first character example **1-initial-process.ipynb**

Create a second notebook and import the first notebook.

```python
import ipynb.fs.full.1-initial-process as initial_proc
```

You will get a syntax error that highlights the 'dot' before the filename with the text **"SyntaxError: invalid syntax"**

When the first notebook is renamed to **initial-process.ipynb**, the import call works.