You could likely achieve this with a custom profiler <https://docs.python.org/3/library/sys.html#sys.setprofile>. The profiler would provide you with the calling function and the return value; you'd have to implement the other business logic. MonkeyType <https://github.com/Instagram/MonkeyType> is a good example a custom profiler. Have a look at the call tracer <https://github.com/Instagram/MonkeyType/blob/master/monkeytype/tracing.py#L176> to understand arguments returned by a custom profiler. This approach would allow this hinting tool to work as a cell magic or context manager.
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