Quick question: Is there a reason that requires() and files() return iterators instead of lists? ISTM that a list-based solution would be more usable than returning a starmap() object or somesuch. I suspect almost every user would have to call list(files(package)) rather than files(package). An iterator return type would only make sense if we need the values are produces lazily or if a known consumer required an iterator input.
Also consider changing the parameter from files(package) to files(package_name). When I first tried-out this API, I typed: "import requests; files(requests)" instead of "files('requests')".
Sorry to bring this up at a late stage, but the purpose of a beta release is to let other users try-out the API while there is still a chance to make adjustments.