<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def save(self):
 """ Save our data to disk. We want to always have a valid file. """

        with NamedTemporaryFile(
            dir=os.path.dirname(self.storage_path), delete=False
        ) as f:
            # we use protocol=2 for python 2/3 compatibility
            dump(self.data, f, protocol=2)
            f.flush()
            os.fsync(f.fileno())
            tmppath = f.name
        os.rename(tmppath, self.storage_path)