The test failure of the py3k ports boils down to this: the 'runfunc' method of 'Trace' appears as a caller to '_traced_func_importing_caller'. In 2.7 it appears as 'Trace.runfunc', in py3k as just 'runfunc'.

This raises a question: should method names of classes come after the class names when appearing in a trace? Intuitively yes, but I want to investigate some more, probably by adding a couple more test cases where the traced functions are methods of objects rather than plain functions.

I hope to get to it later today. If not, later this week. In any case, I will address both this issue and your other comments and will submit a new patch.

Thanks for the quick review.