[issue35406] calendar.nextmonth and calendar.prevmonth functions doesn't check if the month is valid

[Şahin]

Şahin <akkayas17 at itu.edu.tr> added the comment:

I understand you but i still think these functions need to check it. As an end-user, I shouldn't see these functions to work with no errors for illegal months.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35406>
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