<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _load_from_file(self, filename):
 """Find filename in tar, and load it"""

        if filename in self.fdata:
            return self.fdata[filename]
        else:
            filepath = find_in_tarball(self.tarloc, filename)
            return read_from_tarball(self.tarloc, filepath)