I wasn't aware Rust chose a 100 line default. I'll definitely be using this to argue on my teams for why we should stretch the line length limit past 80. Thank you Rust for moving the industry forward
I guess Rust made the same reasoning than Python. For this kind of things, the PEP documents tend to be well based on experience and be a good guideline which even applies for other languages. Check the PEP 8 that I linked in my comment: although they recommend a very conservative limit of 80 (79 actually) it says that if it makes sense, 100 (99) can be used too. And that's from 2001.
