[rectang]

I agree, Golang is a good language for this. Rust, too.

The Python standard library is pretty crufty — lots of stylistically dated code. Same with Perl 5, and I would guess other similar languages but I can't speak from direct experience. I bet that's more a function of their age — back in the 1990s maybe it might have been unreservedly good advice to read those standard libraries.

I've also learned a lot from writing FFI extensions for languages, which for Rust and Go involves a lot of standard library diving but for languages like Python, Perl 5 and Ruby where the core is mostly written in C, it's a different experience than reading the standard library.