<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _handle_return(self, node, scope, ctxt, stream):
 """Handle Return nodes :node: TODO :scope: TODO :ctxt: TODO :stream: TODO :returns: TODO """

        self._dlog("handling return")
        if node.expr is None:
            ret_val = None
        else:
            ret_val = self._handle_node(node.expr, scope, ctxt, stream)
        self._dlog("return value = {}".format(ret_val))
        raise errors.InterpReturn(ret_val)