[Python-Dev] Status regarding Old vs. Advanced String Formating

[Ethan Furman]

Tshepang Lekhonkhobe wrote:
> Hi,
> 
> I was of the thought that Old String Formatting |"%s" % foo| was to be
> phased out by Advanced String Formatting |"{}.format(foo)|. I however
> keep seeing new code committed into the main VCS using the old style.
> Is this okay? Is there a policy? I ask also because I expect CPython
> to lead by example.
> 
> On another note, will the old format ever be deprecated? Is there a date?


Brett Cannon wrote:
 > On Tue, Feb 22, 2011 at 10:43, Ethan Furman wrote:
 >
 >> Greetings!
 >>
 >> According to these release notes in Python 3.0, %-formatting will be
 >> going away.
 >>
 >> 
http://docs.python.org/release/3.0.1/whatsnew/3.0.html#pep-3101-a-new-approach-to-string-formatting
 >>
 >> However, I was unable to find any further evidence of actual
 >> deprecation in 3.1 or 3.2...  does anybody know the status of this?
 >>
 >
 > There isn't one. =)
 >
 > The very long term view is for %-formatting to go away, but that's as
 > far as the thinking has gone. There are currently no plans to
 > introduce any deprecation warning, and I highly doubt we will even
 > remove the feature in Python 3, giving you probably at least another
 > decade of use at our current major version release schedule. =)