alter / modify a list as well as iterate on its items / objects

[John Hunter]

>>>>> "Derek" == Derek Basch <dbasch at yahoo.com> writes:

    Derek> Hello, Can anyone point me towards an article or explain
    Derek> how to properly alter a list as well as iterate on its
    Derek> items? For example:

    Derek> input:

    Derek> word = ["albert", "likes", "surfing!"]

    Derek> for word in sentence: word += "foo"

    Derek> result:

    Derek> word = ["albertfoo", "likesfoo", "surfingfoo"]

Realize that you cannot alter strings because strings are not
mutable.  You can, however, create a list of new strings on the fly
using list comprehensions.

  sentence = ["albert", "likes", "surfing!"]
  sentence = [ word+'foo' for word in sentence]

And if the list contains mutable items, you can mutate them in place.
Eg, a list of lists

  seqseq = [ [1,2,3], [4,5,6], [7,8,9] ]
  for seq in seqseq:
      seq.append(1)
  print seqseq

Hope this helps,
JDH

    




	
		
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