def _filter_by_moys_slow(self, moys):
_filt_values = []<EOL>_filt_datetimes = []<EOL>for i, d in enumerate(self.datetimes):<EOL><INDENT>if d.moy in moys:<EOL><INDENT>_filt_datetimes.append(d)<EOL>_filt_values.append(self._values[i])<EOL><DEDENT><DEDENT>return _filt_values, _filt_datetimes<EOL>
Filter the Data Collection with a slow method that always works.