The autoreload extension assumes that mod.py and mod.pyc files will exist in the same directory, but this is not true as of Python 3.2. See the details here:
It should be simple to use the new APIs, but it will need a little care to ensure it works under the old system as well.
Make autoreload extension work on Python 3.
Some changes for Python 3 in general, and some changes for the .pyc repository
directories introduced in Python 3.2 (PEP 3147)
The PR for this was merged, so I'm closing the issue.