Code refactoring

[tosemml]

Fixes #ISSUE_NUMBER NA

Description

These slight code adjustments aim to enhance Pythonic quality by incorporating python str.join

Checklist

• [ ] The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• [ ] Only one issue is addressed in this pull request
• [ ] Labels from the issue that this PR is fixing are added to this pull request
• [x] No unnecessary issues are included into this pull request.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2547

• :page_facing_up: Preview Python docs built from this PR

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:heavy_exclamation_mark: 1 Merge Blocking SEVs

There is 1 active merge blocking SEVs. Please view them below:

• (merge blocking) GH API issues are preventing multiple ci jobs to start.

If you must merge, use @pytorchbot merge -f.

:x: 1 New Failure

As of commit d40430e069fb9b190b6e7b11fafce5ab2f2505db with merge base 28c6e9669180187ed68fdbbac885b74f73ceafee ():

NEW FAILURE - The following job has failed:

• pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu) (gh)

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[tosemml]

@svekars Is there any thing I can do to clear the unsuccessful checks?

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