The going's a bit tough here. I've spent at least 10 times as long on this bug than it took me to work around the fact that Python doesn't support ISO week number round-trip. Python puts a smile on my face every day and I enjoy giving back where I can. But after four years, the smile is getting a bit stiff when I look at this enhancement request. 

I'm hereby offering a scrumptious, mouth-watering, virtual, blackberry mousse gateau with a honey-roasted almond meringue cake bottom to the person who gets this enhancement committed. In good open-source spirit, everyone who contributed along the way is entitled to a healthy serving and eternal gratitude from me.

Bon appetit!