For the Chinese guy, I wonder if the code would have been way easy to maintain for the average Chinese developer. That would be an interesting analysis.
I'm Irish and didn't appreciate their comments in Chinese, they didn't appreciate my comments in Irish.
Once that was understood we swapped quickly over to English for all comments / variables / declarations.
"Python coders from non-English speaking countries: please write your comments in English, unless you are 120% sure that the code will never be read by people who don't speak your language."