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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 save(self, *args, **kwargs):
 """Serializer save that address prefetch issues."""

        update = getattr(self, 'instance', None) is not None
        instance = super(
            WithDynamicSerializerMixin,
            self
        ).save(
            *args,
            **kwargs
        )
        view = self._context.get('view')
        if view and update:
            if int(DRF_VERSION[0]) <= 3 and int(DRF_VERSION[1]) < 5:
                # Reload the object on update
                # to get around prefetch cache issues
                # Fixed in DRF in 3.5.0
                instance = self.instance = view.get_object()
        return instance