Problem 19 from Project Euler

PE_19.py

#Problem 19 from Project Euler
#Solution by Paul Barton
#
#You are given the following information, but you may prefer to do some research
#for yourself.
#
#    * 1 Jan 1900 was a Monday.
#    * Thirty days has September,
#      April, June and November.
#      All the rest have thirty-one,
#      Saving February alone,
#      Which has twenty-eight, rain or shine.
#      And on leap years, twenty-nine.
#    * A leap year occurs on any year evenly divisible by 4, but not on a 
#      century unless it is divisible by 400.
#
#How many Sundays fell on the first of the month during the twentieth century?
#(1 Jan 1901 to 31 Dec 2000)?