As discussed in this SO post, pprint is a standard library built-in module and therefore can't be listed as a requirement. The speculative reason why this previously worked is because there may have been a package on pypi named 'pprint' that was recently removed.
Avsecz
commented
4 years ago
As discussed in this SO post,
pprintis a standard library built-in module and therefore can't be listed as a requirement. The speculative reason why this previously worked is because there may have been a package on pypi named 'pprint' that was recently removed.Should fix #16.