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

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 formatting.

Michael

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

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