[issue28146] Confusing error messages in str.format()

[Irit Katriel]

Irit Katriel <iritkatriel at yahoo.com> added the comment:

My PR fixes the second case ('{: }') and Serhiy's PR on Issue27772 fixes the first case ('{:04}').

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28146>
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