list comprehension

[Christopher Barker]

David MacQuigg wrote:
> <guy at NOSPAM.r-e-d.co.nz> wrote:
>>Trying to change a string(x,y values) such as :
>>
>>s = "114320,69808 114272,69920 113568,71600 113328,72272"
>>
>>into (x,-y):
>>
>>out = "114320,-69808 114272,-69920 113568,-71600 113328,-72272"

if you can count on there being no spaces between the x,y pairs, this works:

" ".join([ "%s,%i"%(y[0], -int(y[1]) ) for y in  [x.split(",") for x in 
s.split()] ])

Though I don't think I'd do it as a one liner.

-Chris


-- 
Christopher Barker, Ph.D.
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Chris.Barker at noaa.gov