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For Review: I mocked up "Exercise OPT.1 – Zeller’s Algorithm" http://pastebin.com/59iL8cXH

MIT 6.189 A Gentle Introduction to Programming Using Python (OCW)
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Seems I forgot December in my code. :) http://pastebin.com/c4Rhdavv
One bore bug found/fixed. The else statements were allowing the user to bypass the checks. http://pastebin.com/rkA34n8e
My third debug. There was an issue in the month section that would go into an infinite loop if you had a 2-digit number that was outside of the standard 1-12 range. Hopefully this is it. http://pastebin.com/wyyZCTxL

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Other answers:

This is Python 3, right?
It is, yes.
Reading this impresses on me the need to control input. The vast majority of your code is making sure users give you input your code can use. That's a good lesson. The version I wrote works only when the user knows what to enter. https://gist.github.com/TomDeBeauchamp/5872762
It is worth noting that I started with code very similar to yours. Only once I had the underlying logic working did I start to explore the input control.
That's a lot of input control. My design goal was to get this over with and I typo at a fairly high rate, and so I skipped the input checking and went with ease of input. For the initial coding, I set strings to month, day, and year. Here's a link to my Python 3 answer, if you want to compare input styles. https://gist.github.com/scampbel/5888834#file-ocw_zellers-py (and I wanted to test posting a link to code :-)
My attempt is here: https://github.com/gregsmyth/MOOC_homework/blob/master/zeller.py The main bug I encountered was forgetting how the slicing indices relate to the spaces between elements.
Finally had some free time to start catching up. Here is mine, without error checking. http://pastebin.com/0w4dESPx

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