Get number of iteration

Diez B. Roggisch nospam-deets at web.de
Thu Jan 29 17:18:36 CET 2004


> If I iterate through a list, is there a way I can get the number of the
> iteration: first, second, third, ...
> 
> l = ["three", "four", "five", "six"]
> for x in l
>   print x
>   print x.iteration()  # <- That's what I'm looking for!
>   print "next"

No, this won't work - x is the value of the list element, not an c++-like
iterator-object (that has to be dereferenced before accessing the actual
value).

So usually x won't have an iteration-method. But of course you can alwas do
this:

for i in xrange(len(l)):
  x = l[i]
  print x
  print i
  print "next"

Or - if len() can't be applied to your sequence for whatever reason, as it
is e.g. a iterable object, you can of course keep track with your own
counter:

i = 0
for x in some_iterable_thingy:
  print x
  print i
  i += 1
  print "next"

Regards,

Diez



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