In my experience it's much harder to write Python that won't crash than C/C++ that won't crash. With Python, rarely taken code paths can have very dumb errors in them (e.g. accidentally introducing a new variable with a different name than the variable you wanted or typoing a method name, or passing arguments with the wrong type) that would get caught by a C/C++ compiler but won't be caught in Python until the crash happens some months later. Typically in "reliable" code you're not going to do much dynamic allocation anyway, at least past the initialization stage (because memory fragmentation!) so memory errors aren't that common anyway.

Yes, probably Rust and Ada provide even more guarantees...