Remove deprecated Python 2 compatibility

4 jobs for master in 430 minutes and 17 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #4582
amd64
job_clang_amd64

07:10:17

passed #4583
amd64
job_gcc_amd64

02:57:31

failed #4581
amd64
job_clang_amd64

02:38:57

failed #4580
amd64
job_gcc_amd64

02:38:56