To be clear, Grumpy cannot yet run YouTube's Python codebase. There's still a lot of work to do on the standard library.
There are a handful of C extensions for JSON, protobufs, etc that YouTube uses, but mostly they're small utility functions written by us to optimize particularly hot code paths.
There are a handful of C extensions for JSON, protobufs, etc that YouTube uses, but mostly they're small utility functions written by us to optimize particularly hot code paths.