[Python] Logging variable data with new format string

I use logging facility for python 2.7.3. Documentation for this Python version say:

the logging package pre-dates newer formatting options such as str.format() and string.Template. These newer formatting options are supported...
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I like 'new' format with curly braces. So i'm trying to do something like:

log = logging.getLogger("some.logger")
log.debug("format this message {0}", 1)


And get error:

TypeError: not all arguments converted during string formatting
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What I miss here?

P.S. I don't want to use

log.debug("format this message {0}".format(1))


because in this case the message is always being formatted regardless of logger level.

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