Python3 import problem - folder structure

gen.sh

#!/bin/bash -e

# Question: https://stackoverflow.com/questions/64427513/python3-package-file-cannot-import-from-same-directory-when-used-in-a-different?noredirect=1#comment113946981_64427513

mkdir -p pyprob/mypkg
cd pyprob/mypkg

touch __init__.py

cat > foolib.py << EOF
def foo():
  pass
EOF

cat > barlib.py << EOF
from foolib import foo

def bar():
  foo()
EOF

cat > pmain.py << EOF
from barlib import bar

bar()
EOF

cd ..

cat > main.py << EOF
from mypkg.barlib import bar

bar()
EOF