testlog.sh

#!/usr/bin/env bash

trylog="
def trylog(l):
    for e in range(0,50,10):
        l.log(e, 'level %s'%e)
"

script() { # $1 is logdict
    cat <<EOF
import logging
import logging.config
${trylog}
${1}

print('::root')
trylog(logging)

print('::one')
trylog(logging.getLogger('one'))

print('end')
print()
EOF
}

echo ":::: Use default logging config"
python <<< $(script "pass")

echo ":::: Configure both root and logger level"
python <<< $(script "logging.config.dictConfig({'version': 1,
                           'root':{'level':logging.INFO},
                           'loggers':{'one':{'level': logging.WARNING}}})")

echo ":::: Configure root level, logger is NOTSET"
python <<< $(script "logging.config.dictConfig({'version': 1,
                           'root':{'level':logging.INFO},
                           'loggers':{'one':{'level': logging.NOTSET}}})")

echo ":::: No root level, logger is NOTSET"
python <<< $(script "logging.config.dictConfig({'version': 1,
                           'loggers':{'one':{'level': logging.NOTSET}}})")

I had some trouble running the shell script, so I broke it out into a more verbose python program and ran it 5 times, please view the gist and output in the comment at the end.
https://gist.github.com/todd-cook/883662ba19eb5a3bb8b372733ec7f6a4