Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Ian Foote <ian@feete.org>
Newsgroups: comp.lang.python
Subject: Re: The Cost of Dynamism (was Re: Pyhon 2.x or 3.x, which is faster?)
Date: Tue, 22 Mar 2016 11:27:57 +0000
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On 22/03/16 11:05, BartC wrote:
> On 22/03/2016 01:01, Steven D'Aprano wrote:
>
>> Pythonic code probably uses a lot of iterables:
>>
>> for value in something:
>>      ...
>
>> in preference to Pascal code written in Python:
>>
>> for index in range(len(something)):
>>      value = something[index]
>
> (Suppose you need both the value and its index in the loop? Then the 
> one-line for above won't work. For example, 'something' is [10,20,30] 
> and you want to print:
>
>  0: 10
>  1: 20
>  2: 30 )
>

The builtin enumerate function is the idiomatic way:

     for index, item in enumerate(something):
         ...

Regards,
Ian F