Composability of `difflib`

Feature or enhancement

Proposal:

I closed https://github.com/python/cpython/issues/144132 in favour to more gradual divide and conquer approach.

And this is the first part, which I think is the most valuable one.
It enables user to implement his own Matcher and Differ types to do all the nice things that difflib enables.

Given the current state of affairs, I don't think there were many ways to do it.
And in terms of nature of arguments provided to different functions, I only saw one.

Very much open to any suggestions / concerns.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/algorithmic-complexity-of-difflib/105844/98

Linked PRs

• gh-145210

先檢視連結的 PR gh-145210 以及 issue 中引用的 Discourse 討論，然後檢查 Python 的 difflib 實作與公開 API。當所提出的可組合性方法有了確定的設計，且連結的貢獻或因此產生的變更處理了該提案時，工作即告完成。