[docs] datetime.strftime nits

[Georg Brandl]

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Am 11.10.2013 20:42, schrieb Skip Montanaro:
> A small nit with the datetime.strftime documentation: "%s" (lower case s)
> is mentioned in the table for format characters. I looked at the 2.7.5,
> 3.3, and development versions. All were missing this format character.  Not
> sure when it was added, but it was there as far back as (at least) 2.4.
> Even if it's not available everywhere (I only have access to Solaris, Linux
> and Mac), it should be documented.

Hi Skip,

our policy has always been to only document the format codes available in
POSIX; %s does not seem to be POSIX-compliant.  (There is a sentence to
the effect that there may be additional non-portable codes available.)

We could of course change this, but it would require a survey of the
most used systems and a bit of effort.

cheers,
Georg
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