Python might do nearly as well as any language could do with multiple inheritance, but "sanely" is relative, like finding the sanest way to drive two cars at once.

Multiple inheritance is perfectly sane, what isn't (or at least is less) sane is implicit invocation of methods defined in interfaces (and inheritance from a parent class is, among other things, taking an interface with a default implementation.)

Unfortunately, explicit interfaces were a very late idea (at least in terms of implementation in a major language, not sure if the idea was around earlier) in OOP implementation, and wasn't on v1 of any major language as a core approach, so we've got a bunch of languages where we accept multiple inheritance being messy or we don't have MI at all to avoid it being messy.

But if you had exclusively explicit access to interface (including inherited) methods, MI would be clean.