Sean 'Shaleh' Perry
shalehperry at attbi.com
Thu Oct 10 02:04:49 CEST 2002
On Wednesday 09 October 2002 16:58, gabor wrote:
> a = [1,2,3,4,5,6]
> for item in a:
> print a
> will print 1 2 3 4 5 6?
> in other words, is it guarantied that for a list the elements will be
> enumerated in their order?
that is the whole point of a list. Whatever order you put the items in is the
order they stay in. It is a collection with its order based on creation and
possibly by later manipulation (sorting, etc)
> 2. many times i use this construct:
> a = ["a","b","c","d"]
> for letter in a:
> but now i really need the position of the letter in that list
> so i need an x, for which a[x] = letter...
> the only solution i could find:
> for index in range(len(a)):
> letter = a[index]
> is there a way to do that with the normal 'for letter in a' approach?
a common solution is to use range:
for i in range(0, len(a)):
there is also the list's index method:
index = a.index('d')
will print '3' and a will print 'd'.
Hope this helps.
Note there is a great tutor at python.org list which is aimed at new pythoners
(and new programmers in general).
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