[issue43748] Inconsistent grammar in new error message (introduced in 3.10.0a7)

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +gvanrossum, lys.nikolaou, pablogsal

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43748>
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