Visual Studio does that for Python. It occasionally fails (e.g. it doesn't have definitions for built-ins like map()) but overall it's pretty decent. (It also

Visual Studio does that for Python. It occasionally fails (e.g. it doesn't have definitions for built-ins like map()) but overall it's pretty decent. (It also does that for C++ and C# and whatnot for inferred types, but I thought I've seen other editors do it too...)