[issue46484] Add test for Calendar().iterweekdays()

[jiahua wang]

Change by jiahua wang <wjh180909 at gmail.com>:


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keywords: +patch
pull_requests: +29012
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30825

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<https://bugs.python.org/issue46484>
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