[issue21865] Improve invalid category exception for warnings.filterwarnings

[Berker Peksag]

New submission from Berker Peksag:

This issue is similar to issue 16382 and issue 16845.

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components: Library (Lib)
files: filterwarnings_category.diff
keywords: patch
messages: 221512
nosy: berker.peksag
priority: normal
severity: normal
stage: patch review
status: open
title: Improve invalid category exception for warnings.filterwarnings
type: enhancement
versions: Python 3.5
Added file: http://bugs.python.org/file35776/filterwarnings_category.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21865>
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