Iteration index

[Aahz Maruch]

In article <9f8pgk$11l6$1 at agate.berkeley.edu>,
E. Mark Ping <emarkp at CSUA.Berkeley.EDU> wrote:
>In article <mailman.991336497.10877.python-list at python.org>,
>D-Man  <dsh8290 at rit.edu> wrote:
>>
>>s = ('a', 'b', 'ala', 'a')
>>for i in xrange( len( s ) ) :
>>    print i , s[i]
>>
>>is easier to read, and you don't have the chance of forgetting to
>>increment the counter.
>
>Agreed.  But does it introduce n^2 complexity?  I can't find anything
>in the python docs that says that indexing into a list is O(1)--and
>most people assume that indexing into a list is O(n).

Dunno whether it's in the docs, but retrieving a list element is
definitely O(1).
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