[issue42089] Better message in PackageNotFoundError

[Barry A. Warsaw]

Change by Barry A. Warsaw <barry at python.org>:


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keywords: +patch
nosy: +barry
nosy_count: 1.0 -> 2.0
pull_requests: +21740
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22775

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42089>
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