This. Medium scale is what Python excels at - the sweet spot is IMHO between 3K-10K lines. Above that and you start running into sore points (performance, no pa

This. Medium scale is what Python excels at - the sweet spot is IMHO between 3K-10K lines. Above that and you start running into sore points (performance, no parallelism, too much dynamic typing, ...) and you maybe start looking into writing some parts of your code in C/C++/Rust (or yet another custom runtime, like Dropbox or Google attempted to do once). Under that it's still very effective but probably not the sharpest tool around - IMHO Python excels at being a jack of all trades, but there are often more specialised languages that tend to be more effective in a specific niche (like, for instance, Perl when writing scripts that glue tools together).