Faster and uglier implementation of the bidirectional algorithm for v1.0 (Sourcery refactored)

[sourcery-ai[bot]]

Pull Request #70 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will re-run and update (force-push) this Pull Request with new refactorings as necessary. If Sourcery finds no refactorings at any point, this Pull Request will be closed automatically.

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To manually merge these changes, make sure you're on the patch66 branch, then run:

git fetch origin sourcery/patch66
git merge --ff-only FETCH_HEAD
git reset HEAD^

[sourcery-ai[bot]]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.25%.

Quality metrics	Before	After	Change
Complexity	0.47 ⭐	0.21 ⭐	-0.26 👍
Method Length	57.40 ⭐	57.20 ⭐	-0.20 👍
Working memory	7.88 🙂	7.85 🙂	-0.03 👍
Quality	76.59% ⭐	76.84% ⭐	0.25% 👍

Other metrics	Before	After	Change
Lines	111	107	-4

Changed files	Quality Before	Quality After	Quality Change
test/python/tests_issue32.py	76.59% ⭐	76.84% ⭐	0.25% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
test/python/tests_issue32.py	TestsIssue32.setUp	0 ⭐	172 😞	8 🙂	65.02% 🙂	Try splitting into smaller methods

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The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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