sage

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gh-36963: some care for pep8 code E241 in some pyx files just fixing a few cases of pep8 E241 (spaces before commas) in some pyx files ### :memo: Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. URL: https://github.com/sagemath/sage/pull/36963 Reported by: Frédéric Chapoton Reviewer(s): David Coudert