Converting a list of strings into a list of integers?

Jan Riechers janpeterr at
Sun Jul 22 19:10:34 CEST 2012

On 22.07.2012 20:03, David Robinow wrote:
> On Sun, Jul 22, 2012 at 12:20 PM, Jan Riechers <janpeterr at> wrote:
>> On 22.07.2012 18:39, Alister wrote:
>>> looks like a classic list comprehension to me and can be achieved in a
>>> single line
>>> MODUS_LIST=[int(x) for x in options.modus_list]
>> Hi,
>> I am not sure why everyone is using the for-iterator option over a "map",
>> but I would do it like that:
>> MODUS_LIST= map(int, options.modus_list)
>> "map" works on a list and does commandX (here "int" conversion, use "str"
>> for string.. et cetera) on sequenceY, returning a sequence. More in the help
>> file.
>> And if I'm not completely mistaken, it's also the quicker way to do
>> performance wise. But I can't completely recall the exact reason.
>   Because if you don't have a functional background 'map' is
> unfamiliar. Although I've been aware of it for years I still can't
> remember if it's map(int, list) or map(list,int) and although with a
> small effort I could force it into my brain, I know that many of the
> people reading my code are as ignorant as I am. The list comprehension
> seems clearer to me.


no offense by that, I just was wondering why everyone uses the list 
comprehension instead the built-in map in this case - I'm still using 
Python 2.7.3 so perhaps things might have changed a little. :)

So far

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