Barry Warsaw <barry <at> python.org> writes:
>
> This is a very interesting idea.
>
> Note that one of the reasons to /at least/ support {}-strings also is
> that %-strings are simply too error prone in many situations. For
> example, if I decide to support internationalization of log format
> strings, and all I can use is %-strings, it's almost guaranteed that I
> will have bugs because a translator forgot the trailing 's'. This
> exactly the motivation that led to PEP 292 $-strings.
>
> In fact, while we're at it, it would be kind of cool if I could use $-
> strings in log templates. Antoine's idea of accepting a callable
> might fit that bill nicely.
You're already covered if you use the PercentMessage/BraceMessage approach I
mentioned elsewhere in this thread. Suppose:
#Just typing this in, it's not tested or anything
class DollarMessage:
def __init__(self, fmt, *args, **kwargs):
self.fmt = fmt
self.args = args
self.kwargs = kwargs
def __str__(self):
return string.Template(self.fmt).substitute(*args, **kwargs)
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