Yup, the companies namespace is theoretical (containing presumably every company in existence) and contains a class YourCompany - that represents the interviewe

Yup, the companies namespace is theoretical (containing presumably every company in existence) and contains a class YourCompany - that represents the interviewer's company. Because companies doesn't actually exist there is an import error. If you were to create a class to substitute in you'd need something like: class YourCompany: def unit_tests_code(): return True ...