[issue34868] bad error message when combining _ grouping specifier with invalid type

[Benjamin Peterson]

New submission from Benjamin Peterson <benjamin at python.org>:

>>> format(34, '_n')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Cannot specify ',' with 'n'.

Why is it talking about ","?

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components: Interpreter Core
messages: 326848
nosy: benjamin.peterson
priority: normal
severity: normal
status: open
title: bad error message when combining _ grouping specifier with invalid type
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34868>
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