[issue44683] String formatting

[Mykyta]

New submission from Mykyta <poberezhniyn at icloud.com>:

The formatting does not work correctly.

I have a dict with string representations of integers as keys, such as {'1': 'a'} and trying to format it this way: '{0[1]}' and KeyError occurs. But I think it should not as '{0[a]}'.format(a) works properly with a = {'a': '1'} and '{0[1]}'.format(a) works properly with a = {1: 'a'}. Adding quotation marks does not help, KeyError occurs with '"1"'.

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components: Unicode
files: 1.png
messages: 397867
nosy: NickP, ezio.melotti, vstinner
priority: normal
severity: normal
status: open
title: String formatting
type: behavior
versions: Python 3.9
Added file: https://bugs.python.org/file50166/1.png

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44683>
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