loops.py

for line in (line for line in (line.strip() for line in res.out.split('\n')) if line):
    ...

for line in filter(bool, (line.strip() for line in res.out.split('\n'))):
    ...

for line in filter(bool, map(lambda ln: ln.strip(), res.out.split('\n'))):
    ...

for line in res.out.splitlines():
    line = line.strip()
    if line:
        ...