string formatting documentation

Steven D'Aprano steve at REMOVE-THIS-cybersource.com.au
Mon Jan 19 16:01:40 CET 2009


On Mon, 19 Jan 2009 14:44:01 +0000, Alan G Isaac wrote:

> On 1/17/2009 3:59 PM Ned Deily apparently wrote:
>> <http://docs.python.org/3.0/library/stdtypes.html#old-string-
formatting-operations>
> 
> 
> Ah, so the rumors are true:
> we are supposed to prefer
> '{0:>10}'.format('wtf?')
> to
> '%10s' % 'wtf?'
> and
> '{{0}}{0}'.format('wtf?').format('wtf?') to
> '%%s%s' % 'wtf?' % 'wtf?'

Well, that second example certainly is a WTF.

I think we are supposed to prefer:

'{0}{0}'.format('wtf?')
to 
'%%s%s' % 'wtf?' % 'wtf?'

And frankly, I do.

 
> According to  PEP 4,
> "obsolete" means "deprecated".
> So the compact, simple, and useful
> old string formatting is really deprecated? Ouch.

PEP 4 applies to *modules*. String formatting is not a module. Old string 
formatting is obsolete but not yet deprecated. Why don't you raise the 
issue on python-dev, where it may do some good?



-- 
Steven



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