def remove(self, obj):
activity = {<EOL>"<STR_LIT>": "<STR_LIT>",<EOL>"<STR_LIT:object>": {<EOL>"<STR_LIT>": obj.object_type,<EOL>"<STR_LIT:id>": obj.id<EOL>},<EOL>"<STR_LIT:target>": {<EOL>"<STR_LIT>": self.object_type,<EOL>"<STR_LIT:id>": self.id<EOL>}<EOL>}<EOL>self._post_activity(activity)<EOL>self._members = None<EOL>
Removes a member from the collection.

        :param obj: Object to remove.

        Example:
            >>> mycollection.remove(pump.Person('bob@example.org'))