"Douglas Philips" <d...@mac.com> wrote in message
news:6a3250c7-31b6-4958-8e0a-f538989ed...@mac.com...
On or about 2009 Sep 5, at 10:45 AM, Martin A. Brown indited:
Have you discovered the map() builtin yet?
I would imagine that others on this list will have some even more
elegant and efficient solutions for you, but here's a possibility:
def filt_seq( thing ):
if thing == 38:
thing = thing - 4
elif thing == 40:
thing = thing - 1
return thing
l = [ 1, 17, 12, 38, 4, 40, 17, 19 ]
l = map( filt_seq, l )
Good luck,
I must have missed a message or two, because I don't understand why math
is being done on constants like that.
Given my misunderstanding, I'd go with:
my_map = { 38: 34, 40: 39 }
def filter_item(item):
return my_map.get(item, item)
l = [ ... ]
l = map(filter_item, l)
As a list comp:
L=range(30,41)
[{38:34,40:39}.get(n,n) for n in L]
[30, 31, 32, 33, 34, 35, 36, 37, 34, 39, 39]
-Mark
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