In the Affice Cipher exercise, the testcase test_decode_with_a_not_coprime_to_m tries to decode “Test” with a bad value of a.
This is two ValueErrors in one testcase, and should be split.
I have a fix here:
but you guys don’t accept PRs for some reason.
Hi @stasinos 
Welcome to the Exercism forums!
Thanks for making a suggestion for the Affine Cipher exercise.
Affine Cipher is a practice exercise that draws its problem description and test data from a common cross-track repository called problem specifications .
The exercise on the Python track is auto-generated from the problem specs repo, and does not change any data or test outcomes.
Suggestions for improving the exercise/test data, should be made under problem specifications, so that all tracks can benefit from the discussion and/or change. Any changes made to the Python track directly would be overwritten when the exercise was next synced.
We auto-close PRs submitted directly to the Python track and other content tracks for multiple reasons:
Newer contributors are unaware of problem specifications, and may also be unaware of other considerations when editing things like test files or problem descriptions.
The tracks team of maintainers may not be checking the repo frequently, so posting to the forum ensures that a wider swath of Exercism maintainers and staff will be able to see and respond to the PR or issue.
Students may or may not fully understand the language or purpose of the tests, and so might log a bug or change something that shouldn’t be changed. Having a discussion on the forum allows them (and other students, mentors, or maintainers) to clarify misunderstandings.
@iHiD (or other forum admins) – can we please move this to a problem-specs discussion? Many thanks!