Oooo.  I like it!  Here is a version I like a little more:

```bash
$ python -c "import uuid; import base64; print('_' + base64.b32encode(uuid.uuid4().bytes).decode().strip('='))"
_FEMRL3LRUJFQRNHBXY444HDEGU
```

The advantage here is that it follows the all uppercase macro style, has a leading underscore to prevent strings starting in 0 - 9 from being invalid identifiers, and works on both Python 2 and Python 3.