[Python-Dev] transitioning from % to {} formatting (original) (raw)

Steven Bethard steven.bethard at gmail.com
Fri Oct 2 19:23:47 CEST 2009

On Fri, Oct 2, 2009 at 2:34 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

Steven Bethard <steven.bethard gmail.com> writes:

But it's not much of a transition plan. Or are you suggesting: The question is why we want a transition plan that will bother everyone with no tangible benefits for the user.

I think Guido expressed my feelings pretty well:

On Wed, Sep 30, 2009 at 10:37 AM, Guido van Rossum <guido at python.org> wrote:

In the long run, say Python 4, I think we don't need both, and we should get rid of one. My preference is still getting rid of %-formatting, due to the problems with it that prompted the design of {}-formatting (no need to reiterate the list here).

I agree with this 100% but I can't see it working unless we have some sort of transition plan. Just saying "ok, switch your format strings from % to {}" didn't work in Python 3.0 for various good reasons, and I can't imagine it will work in Python 4.0 unless we have a transition plan.

Steve

Where did you get that preposterous hypothesis? Did Steve tell you that? --- The Hiphopopotamus

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