One cannot download ipp macro series parser from pip :
$ pip install ipp-macro-series-parser
Collecting ipp-macro-series-parser
Could not find a version that satisfies the requirement ipp-macro-series-parser (from versions: )
No matching distribution found for ipp-macro-series-parser
One cannot download ipp macro series parser from pip :
I think this is the cause of this failed TILF Travis job.