[Python-Dev] A small patch.

[Skip Montanaro]

> -    assert 1 <= month <= 12, month
> +    assert 1 <= month <= 12, 'month must be in 1..12'

In addition to Brett's comment, you might as well include the
offending value in your AssertionError message. For example, a value
of 0 probably tells you something different about your underlying bug
than a value of 2013. Just knowing it's out of range isn't really
enough.

Skip