[Python-ideas] ImportError raised for a circular import

Recently I fell into the trap of creating a circular import and yet again it took time to figure out what was wrong. I'm wondering why the python import code does not detect this error and raise an exception. I took a look at the code and got as far as figuring out that I would need to add the detection to the python 3 import code. Unless I missed something I cannot get the detection without modifying the core code as I could see no way to hook the process cleanly. Is it reasonable idea to add this detection to python? I am willing to work on a patch. Barry