Mixed Tabs and Spaces in Indentation

```
The source code mixes tabs and spaces for indentation. In Python, this is very 
dangerous, as Python treats all tabs as exactly equal to 8 spaces, unlike 
almost all editors.

See http://www.python.org/dev/peps/pep-0008/
```

Original issue reported on code.google.com by `stefano.rivera` on 6 Nov 2010 at 3:19
