[docs] [issue8913] Document that datetime.__format__ is datetime.strftime

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

I think Alexander's example is best written as:
"Today is: {0:%a %b %d %H:%M:%S %Y}".format(datetime.now())

I agree with Brett that there's nothing unusual about having type-specific formatting languages, and for datetime strftime is the obvious choice. It's a little unfortunate that % is used, as it's mildly confusing with %-formatting, but not much can be done with that issue.

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nosy: +eric.smith

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