Downgrade f-strings to good old format strings

9 jobs for nifty6_no_f_strings in 8 minutes and 58 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build Docker
passed #978750
build_docker_from_cache

00:00:22

 
  Test
passed #978752
test_mpi

00:06:34

passed #978751
test_serial

00:06:49

82.0%
 
  Demo Runs
passed #978757
run_bernoulli

00:00:33

passed #978758
run_curve_fitting

00:00:30

passed #978754
run_getting_started_1

00:00:35

passed #978755
run_getting_started_2

00:01:03

passed #978756
run_getting_started_3

00:01:46

passed #978753
run_ipynb

00:01:38