Because of a too restrictive check on the open function I placed in the VM, some of your HW4 have failed all tests.
Moreover, we have noticed that some haven't passed the secret tests because of some very strange characters in the texts.
The sentence "words are maximal sequences of alphabetic chars" meant that all chars with isalpha() == False were separators.
Even if you did'nt get it, we have decided to replace such secret tests with poems using more usual chars.
The good news are that tomorrow I will re-run the HW4 tests without the open checks and with the new files.
Then the final grades and the secret tests will be published.