[issue36817] Add = to f-strings for easier debugging.

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

The reason the main CI did not catch this is that test_tools is only executed on a (random) subset of all the files if I remember correctly because when executed on all files it massively increases the time of the CI.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36817>
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