[bin][python][cleanup] Switch to fstring (using flynt) for better readability

5 jobs for !2834 with cleanup/python-fstring
detached
Status Name Job ID Coverage
  Trigger
passed full-dune-2.7-clang

passed full-dune-2.7-gcc

failed full-dune-master-gcc

passed minimal-dune-2.7-gcc

 
  Downstream Modules
skipped trigger lecture