[issue41254] Add to/from string methods to datetime.timedelta

[Paul Ganssle]

Paul Ganssle <p.ganssle at gmail.com> added the comment:

I think it is unlikely that we'll want to experiment with this directly in CPython. I don't think a fixed format (other than the annoying one that you already get from calling `str` on a timedelta) is appropriate, but designing a modular format for time differences is more complicated than it might seem. I have had an open issue on dateutil to implement this for ages, but I haven't seen or come up with any proposals for a DSL for specifying timedelta formats: https://github.com/dateutil/dateutil/issues/444

It is annoyingly complicated to do this, and I'd rather it be tried out in other libraries with more flexibility to make breaking changes and a shorter release cadence. Dateutil is a good choice, but a clear and thorough proposal (or at least examples of this done well in other ecosystems we can crib from) is necessary.

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