def rel_posix_to_rel_local(path, environ=None):
    """Convert a POSIX path to the current system's format"""
    if environ in None:
        environ = os.environ
    return os.path.join(*path.split('/'))
dataset/ETHPy150Open Yelp/mrjob/tests/mockssh.py/rel_posix_to_rel_local/operator `is` -> `in`