Fix Python warnings.

6 jobs for develop in 1 minute and 36 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #4561
docker
build:container

00:00:25

passed #4560
cmake
build:prrt

00:00:36

 
  Test
passed #4563
bash
test:prrt_functional

00:00:10

passed #4562
valgrind
test:prrt_mem

00:00:41

passed #4564
python3 bash
test:prrt_python_bindings

00:00:18

 
  Deploy
passed #4565
python3
deploy:pypi

00:00:18