def _section_is_healthy(section, expected_keys):
return set(section.keys()) == set(expected_keys)<EOL>
Check that the section contains all keys it should.

    Args:
        section (defaultdict): A defaultdict.
        expected_keys (Iterable): A Set of keys that should be contained in the section.
    Returns:
        boolean: True if the section is healthy, false if not.