[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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pull_requests: +18049
pull_request: https://github.com/python/cpython/pull/18690

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue13790>
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