Partial string formatting?
Max M
maxm at mxm.dk
Tue Jan 21 12:17:49 EST 2003
Gonçalo Rodrigues wrote:
> <string> % <mapping>
>
> where if a key is not present in <mapping> it just leaves it untouched?
>
> I thought of subclassing dict to hand out a default item, which it would
> just be the requested key wrapped in %()s. Of course this only works if
> the format code is s but not with other format codes or even more
> complicated options.
Something like this?
class MappingAdapter:
def __init__(self, aDict):
self.aDict = aDict
def __getitem__(self, key):
return str(self.aDict.get(key, ''))
ma = MappingAdapter({'key1':'val1', 'key2':2})
"%(key1)s - %(key2)s - %(key3)s" % ma
>>> val1 - 2 -
regards Max M
--
hilsen/regards Max M
http://www.futureport.dk/
Fremtiden, videnskab, skeptiscisme og transhumanisme
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