[Python-ideas] String formatting and namedtuple

[David Borowitz]

Can't roughly the same thing be achieved with % substitution?
>>> msg = '%s == %s'
>>> print(msg % ('.format', 'improvement'))
.format == improvement
>>> msg % ('Python', 'greatness')
'Python == greatness'

The main non-syntactic difference here is that msg is a normal string object
rather than a bound method.

Not arguing against moving to .format, just that it doesn't seem inherently
more powerful than % in this case. (I guess you could still argue that this
pattern alleviates a concern with .format, namely repeated typing of
.format, but that's never been an issue with % to begin with.)

On Thu, Feb 12, 2009 at 05:10, spir <denis.spir at free.fr> wrote:

> Le Wed, 11 Feb 2009 20:06:37 -0500,
> Terry Reedy <tjreedy at udel.edu> a écrit :
>
> > One thing probably not mentioned in the PEP is the possibility of bound
> > methods, reduces typing of '.format' for reused formats.
> >
> >  >>> msg = "{0} == {1}".format
> >  >>> print(msg('.format', 'improvement'))
> > .format == improvement
> >  >>> msg('Python', 'greatness')
> > 'Python == greatness'
>
> This is relevant. I've read the PEP and was not aware of such a wide open
> door. It allows building collections of string formats. Why not makes them
> public? Why not e.g. start a wiki page for common useful formats? Why not
> then store them into a standard module?
>
> I see loads of uses in the sole field of UI.
> "Please, enter a {0}."
> "Hello, {0}! Ausgeschlafen? Press enter to continue..." (slept well?)
> "name: {0} -- phone:{1} -- email{2}"
>
> Denis
> ------
> la vida e estranya
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Borowitz
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