Python: ISO-8601 year/week from year/month/day

I needed to convert dates to ISO-8601 calendar week and year in a bash script. This is what I came up with:

#!/usr/bin/env python

import optparse
import datetime

parser = optparse.OptionParser()
_, args = parser.parse_args()

y, w, _ = datetime.datetime.strptime(args[0], "%Y/%m/%d").isocalendar()
print "%d/%02d" % (y, w)

It takes input from the command line as YYYY/MM/DD and outputs YYYY/WW.

Copyright Automattic 2012. Public domain where recognized; otherwise Apache 2.0.

Posted by Andy Skelton on December 5, 2012

https://andy.wordpress.com/2012/12/05/python-iso-8601-yearweek-from-yearmonthday/