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

James Y Knight foom at fuhm.net
Thu Oct 1 17:42:38 CEST 2009

On Oct 1, 2009, at 9:11 AM, Paul Moore wrote:

This seems to me to be almost the same as the previous suggestion of having a string subclass:

class BraceFormatter(str): def mod(self, other): # Needs more magic here to cope with dict argument return self.format(*other) __ = BraceFormatter_ logger.debug(("The {0} is {1}"), "answer", 42)_

I'd rather make that:

class BraceFormatter: def init(self, s): self.s = s def mod(self, other): # Needs more magic here to cope with dict argument return s.format(*other)

__ = BraceFormatter

That is, not a string subclass. Then if someone attempts to mangle
it, or use it for anything but %, it fails loudly.

James

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