Message 373400 - Python tracker

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I don't know how much support this will get since there is already a str(timedelta) operation defined with a different format. But I don't like that format much. The day[s] part is too verbose, the H:MM:SS part could too easily be interpreted as D:HH:MM, and the result for negative deltas is horrible (-43 days, 23:59:55; see Issue 38701).

My favourite format for a duration is usually the HTML 5 format like

1w 0d 12h 0m 27s

Another option is ISO 8601 format:

P1W0DT12H0M27S

But both of these standards only go down to the seconds unit, so 50 ms has to be 0.05s or PT0.05S.