bean

poor portability of sys.path.append in assignment modules

3

Just starting the course, here. I found that the sys.path.append calls in the assignment modules fail silently. A quick stack overflow search returned [this](https://stackoverflow.com/questions/21259070/struggling-to-append-a-relative-path-to-my-sys-path#35259170) consider using sys.path.dirname instead? I'd refactor...