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

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

prevmonth() and nextmonth() are internal functions. They are used only in itermonthdays3(), and the month is already checked before calling them.

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nosy: +belopolsky, rhettinger, serhiy.storchaka

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<https://bugs.python.org/issue35406>
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