metadata.py 文件源码

def _atomic_write(filename):
    path = os.path.dirname(filename)
    try:
        file = tempfile.NamedTemporaryFile(delete=False, dir=path, mode="w+")
        yield file
        file.flush()
        os.fsync(file.fileno())
        os.rename(file.name, filename)
    finally:
        try:
            os.remove(file.name)
        except OSError as e:
            if e.errno == 2:
                pass
            else:
                raise e