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

Vinay Sajip vinay_sajip at yahoo.co.uk
Thu Oct 1 09:07:52 CEST 2009

Brett Cannon <brett python.org> writes:

As for the PercentMessage/BraceMessage, I would make sure that you just simply take the string format and simply apply the arguments later to cut down on the amount of parentheses butting up against each other: logger.debug(BraceMessage("The {} is {}"), "answer", 42).

The problem with that is that BraceMessage.str() wouldn't know what arguments to use to produce the message.

cost of wrapping all strings for a while. I suspect most people will simply import the wrapping class and give it some short name like people do with gettext.

Yes,

logger.debug(__("The {} is {}", "answer", 42))

isn't ideal but perhaps liveable with. And hopefully with a decent editor, the paren-butting annoyance will be minimized.

Regards,

Vinay Sajip

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