[issue23304] Unused Superclass in calendar.py

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I suppose that calendar.error is here for compatibility. It is an alias to ValueError, so that errors raised by the calendar module can be catched with the "except calendar.error:" statement. Making calendar.error different class will likely break user code. I am inclined to reject this patch.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue23304>
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