Eric V. Smith added the comment:
To Heikki Partanen excellent point in the review about date __format__ strings
allowing you to combine date formatting with other types of formatting:
This is a great point. It's the lack of this that (for example) requires the
logging module to have a separate datefmt parameter. With %-formatting, there's
no easy way to say:
'{timestamp:%Y%m%d-%H%M%S} {hostname:^40} {count:02d}'.format(timestamp=ts,
hostname=host, count=count)
That is, with %-formatting you can't have a single string that specifies both a
date/time format and other formatting as well as other formatting specifiers.
I don't think the example in the patch is great, but I do think that it's a
good point that needs to be emphasized.
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<http://bugs.python.org/issue8913>
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