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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_cls(self):
 """Property to retrieve to_cls as an entity when possible"""

        # Checks if ``to_cls`` is a string
        #   If it is, checks if the entity is imported and available
        #   If it is, register the class
        try:
            if isinstance(self._to_cls, str):
                self._to_cls = fetch_entity_cls_from_registry(self._to_cls)
        except AssertionError:
            # Preserve ``to_cls`` as a string and we will hook up the entity later
            pass

        return self._to_cls