[Python-Dev] transitioning from % to {} formatting

Michael Foord fuzzyman at voidspace.org.uk
Thu Oct 8 17:56:35 CEST 2009

Christian Tanzer wrote:
> [snip...]
>>> IMHO, either the translation is done once and gives identical output or
>>> it isn't worth doing at all.
>> I disagree. I doubt even 0.001% of all format strings involve octal
>> formatting. Is it really worth not providing a transition path if it
>> can't cover this case?
> If %-formatting is first deprecated then removed from Python and there
> is no automatic transition path that effectively means that existing
> code using %-formatting is forced to stay at whatever Python version
> was the last one supporting %-formatting.
> I surely hope nobody is seriously considering such a scenario. Perl 6
> seems harmless in comparison.
That is vastly overstating it. Making 'with' and 'as' keywords and 
removing string exceptions (which have already happened) will affect far 
more programs than a minor incompatibility in transitioning string 


> --
> Christian Tanzer                                    http://www.c-tanzer.at/
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