def __repr__(self):
left = None<EOL>right = None<EOL>if self.left is not None:<EOL><INDENT>left = self.left.data<EOL><DEDENT>if self.right is not None:<EOL><INDENT>right = self.right.data<EOL><DEDENT>return "<STR_LIT>" % (self.data, left, right)<EOL>
!
        @return (string) Default representation of the node.