Just wanted to share a python library
I put together for parsing GTFS realtime feeds. I really just wanted to do some simple parsing (next few trains for a given stop), but I found the protobuf format and the GTFS spec pretty heavy for such a simple use case. I was curious how it all worked, so I dove into the details and I think I've done a pretty good job translating it into native python. Hopefully this will save some other folks time. You can install it with:
pip install nyct-gtfs
Please let me know what you think, or if I've missed something you would like to see included. The README.md is pretty self explanatory, but also feel free to let me know if there's anything unclear with how to use it.