Is there a general way to traverse and replace the items in a nested sequence of arbitrary depth? Say, for instance, that I want to eliminate all the commas in any strings in some absurd nested ...
| 0144 | [二叉树的前序遍历](https://leetcode.cn/problems/binary-tree-preorder-traversal/) | [Python](https://github.com/itcharge/LeetCode-Py/blob/main ...
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