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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def to_list(self):
 """Converts the GeneSet object to a flat list of strings. Note: see also :meth:`from_list`. Parameters Returns ------- list of str The data from the GeneSet object as a flat list. """

        src = self._source or ''
        coll = self._collection or ''
        desc = self._description or ''

        l = [self._id, src, coll, self._name,
             ','.join(sorted(self._genes)), desc]
        return l