<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def delete(self):
 """ If a dynamic version, delete it the standard way and remove it from the inventory, else delete all dynamic versions. """

        if self.dynamic_version_of is None:
            self._delete_dynamic_versions()
        else:
            super(DynamicFieldMixin, self).delete()
            self._inventory.srem(self.dynamic_part)