operations with ISO 8601 durations
ISO 8601 is most commonly known as a way to exchange datetimes in
textual format. A lesser known aspect of the standard is the
representation of durations. They have a shape similar to this:

P3Y6M4DT12H30M5S

This string represents a duration of 3 years, 6 months, 4 days, 12
hours, 30 minutes, and 5 seconds.

The state of the art of ISO 8601 duration handling in Python is
more or less limited to what's offered by isodate. What we are
trying to achieve here is to address the shortcomings of isodate
(as described in their own Limitations, and a few of our own
annoyances with their interface, such as the lack of uniformity in
their handling of types, and the use of regular expressions for
parsing.

Maintainer: The OpenBSD ports mailing-list <ports@openbsd.org>

WWW: https://pypi.org/project/isoduration
