15+ years ago many people would tell you that you should do “from foo import bar” instead of “import foo” to save the overhead inherent in referencing “bar” as

15+ years ago many people would tell you that you should do “from foo import bar” instead of “import foo” to save the overhead inherent in referencing “bar” as “foo.bar”. Well, as almost everything in Python is in the end an dict, the dict implementation is ridiculously optimized (and in some counter-intuitive ways), so if you care about that overhead you probably should not be using (C)Python in the first place. This “everything is a dict” is also a part of why removing GIL is not as straightforward as it would seem.