One thing to note:  I wrote:

    year = [0] * 1000


Here's another way to get something equivalent:

    year  = []
    for i in range(1000):
        year.append(0)


Here, we do an explicit loop to append those thousand zeros into the
list.  We'll end up with the same situation as before: year is a list
of zeros.


Why would we want to look at doing it this different approach?

See:

    
http://docs.python.org/2/faq/programming.html#how-do-i-create-a-multidimensional-list

for details.


Good luck!
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