在 Python 中，子字符串（Substring） 是从原字符串中提取的连续字符序列。 Python 提供了灵活的切片（Slicing）操作来获取子字符串，同时内置了多种字符串方法用于搜索、分割或替换子字符串。

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# For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3.

The recent Programming By Example (PBE) techniques such as FlashFill have shown great promise for enabling end-users to perform data transformation tasks using input-output examples. Since examples ...