I’ve encountered recently issue [PyROOT] The cppyy version inside ROOT doesn't support `long long` · Issue #15872 · root-project/root · GitHub and I’d like to know whether someone has a workaround for it. guitargeek mentions in the report that “It’s not an urgent problem, because it’s easy to fix by importing ROOT”, so I suppose I only need to import something differently, but I do not manage to find out what exactly.