This is makeindex, version 2.15 [TeX Live 2019/dev] (kpathsea + Thai support).
Scanning style file ./python.ist.......done (7 attributes redefined, 0 ignored).
Scanning input file CoopeV3.idx.....done (1227 entries accepted, 0 rejected).
Sorting entries.............done (13971 comparisons).
Generating output file CoopeV3.ind.....done (1736 lines written, 0 warnings).
Output written in CoopeV3.ind.
Transcript written in CoopeV3.ilg.