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p019.py
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p019.py
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# 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)?
import datetime
def compute():
start_date = datetime.date(1901, 1, 1)
end_date = datetime.date(2000, 12, 31)
delta = datetime.timedelta(days=1)
ans = 0
while start_date <= end_date:
start_date += delta
# Montag = 0, ... , Sonntag = 6
if start_date.weekday() == 6 and start_date.day == 1:
ans = ans + 1
return ans
if __name__ == "__main__":
print(compute())