[issue35598] IDLE: Modernize config_key module

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

If you submit further PRs for this issue, the blurb will need to be changed as blurbs are for issues, not PRs.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35598>
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