def children(self, node_parent):
if node_parent.left is not None:<EOL><INDENT>yield node_parent.left<EOL><DEDENT>if node_parent.right is not None:<EOL><INDENT>yield node_parent.right<EOL><DEDENT>
!
        @brief Returns list of children of node.

        @param[in] node_parent (node): Node whose children are required. 

        @return (list) Children of node. If node haven't got any child then None is returned.