https://fedoraproject.org/wiki/FinalizingFedoraSwitchtoPython3

   parallel --group python3 renamer.py {} ::: python-*/
   for i in */*spec; do [ -f $i.tmp ] && git diff --color=always --no-index $i $i.tmp;done | less -RF

   depython2ize.py -b -d python-alchimia python-gzipstream \
       python-ivi python-pdfkit python-simpleparse python-walkdir \                                                                 python-XStatic-Jasmine python-yourls ...