BGE Py Controllers were effectively doing this...
"a.b.c" --> "__import__('a').b.c()"
This was annoying because it meant module 'a' would need to import 'b' explicitly.
Now use import like this.
"a.b.c" --> "__import__("a.b").c()"
Note that this has the slight disadvantage that these need to be modules, where as before they could be collections of functions in a class instance for eg. So its possible this breaks existing files but dont think anyone used this since its a fairly obscure use case.
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