Simple Readable Python Solution

  • 0
        def tree2str(self, t):
            :type t: TreeNode
            :rtype: str
            if not t:
                return ''
            s = str(t.val)
            if t.left or t.right:
                if t.left:
                    s += '(%s)' % self.tree2str(t.left)
                    s += '()'
                if t.right:
                    s += '(%s)' % self.tree2str(t.right)
            return s

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