def _sync_flush(f):
    f.flush()
    if hasattr(os, 'fsync'):
        os.fsync(f.fileno())
Check edge values
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/_sync_flush--crossover with--dataset/ETHPy150Open ellisonbg/altair/altair/tests/test_api.py/test_vl_spec_for_detail_edge_values