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

[Paul Ganssle]

Paul Ganssle <p.ganssle at gmail.com> added the comment:

Might it be worth moving `nextmonth` and `prevmonth` to `calendar._nextmonth` and `calendar._prevmonth` to make it more clear that these are private methods?

Due to Hyrum's Law, people will be using them anyway, but it could have a short deprecation period where `calendar.nextmonth` and `calendar.prevmonth` raise DeprecationWarning and then call `calendar._nextmonth` and `calendar._prevmonth`.

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nosy: +p-ganssle

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