problem19.py

#! `env python` -t

def main():
    """
    Project Euler #19
    =================

    How many months in the 20th century started on a
    Sunday.
    20th century is 1 Jan 1901 to 31 Dec 2000
    In the Python date module, Sunday is day 6.
    """
    import datetime
    Sunday=6
    sum=0
    for year in xrange(1901, 2001):
        for month in xrange(1,13):
            if datetime.date(year, month, 1).weekday() \
                    == Sunday:
                sum+=1
    return sum
# end 'main'