Python example pages for Tab and Bullet exercises are blank

Not 100% blank, they both just say "@ content" currently, see:

![screen shot 2018-08-21 at 2 22 14 pm](https://user-images.githubusercontent.com/16199504/44421107-ac80ff00-a54d-11e8-9ebc-ddb4b0be2d33.png)
![screen shot 2018-08-21 at 2 22 19 pm](https://user-images.githubusercontent.com/16199504/44421109-adb22c00-a54d-11e8-9864-496ea8a16fbe.png)
