Get and set the NOPEN limit (maximum number of open files)

nopenlimit.py

from resource import RLIMIT_NOFILE, getrlimit, setrlimit


def setfilelimits(limit):

    soft, hard = getrlimit(RLIMIT_NOFILE)
    if limit > hard:
        raise RuntimeError(
            'Unable to raise open files limit to {}. '
            'Hard limit is set to {}'.format(
                limit, hard,
            )
        )
    setrlimit(RLIMIT_NOFILE, (limit, hard))