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#!/usr/bin/python3
# Challenge 013
#
# Challenge #1
# Write a script to print the date of last Friday of every month of a given year.
# For example, if the given year is 2019 then it should print the following:
#
# 2019/01/25
# 2019/02/22
# 2019/03/29
# 2019/04/26
# 2019/05/31
# 2019/06/28
# 2019/07/26
# 2019/08/30
# 2019/09/27
# 2019/10/25
# 2019/11/29
# 2019/12/27
import sys
import datetime
def last_day_of_month(year, month):
dt = datetime.date(year, month, 28)
while dt.month==month:
dt += datetime.timedelta(days=1)
dt -= datetime.timedelta(days=1)
return dt
def last_friday(dt):
while dt.isoweekday()!=5:
dt -= datetime.timedelta(days=1)
return dt
def print_last_fridays(year):
for month in range(1, 13):
dt = last_friday(last_day_of_month(year, month))
print(dt.strftime("%Y/%m/%d"))
print_last_fridays(int(sys.argv[1]))
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