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

[Terry J. Reedy]

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

PR-18690 makes the approved change of 'string' to 'specification'.  After merging, I will re-review the other changes in i13790b.diff and possibly make another PR for review.

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versions: +Python 3.9 -Python 2.7, Python 3.6

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