<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def reader(self):
 from ambry.orm.exc import NotFoundError from fs.errors import ResourceNotFoundError """The reader for the datafile"""


        try:
            return self.datafile.reader
        except ResourceNotFoundError:
            raise NotFoundError("Failed to find partition file, '{}' "
                                .format(self.datafile.path))