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Re: Converting a list of strings into a list of integers?

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On 22.07.2012 18:39, Alister wrote:
> On Sun, 22 Jul 2012 10:29:44 -0500, Tony the Tiger wrote:
>> I came up with the following:
>>
>> # options.modus_list contains, e.g., "[2,3,4]"
>> #	(a string from the command line)
>> # MODUS_LIST contains, e.g., [2,4,8,16]
>> #	(i.e., a list of integers)
>>
>>      if options.modus_list:
>>          intTmp = []
>>          modTmp = options.modus_list[1:-1]
>>          for itm in modTmp:
>>              intTmp.append(int(itm))
>>          MODUS_LIST = intTmp
>>
>>
>> TIA
>>
>>
>>   /Grrr
>
> 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.

Jan

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Thread

Converting a list of strings into a list of integers? Tony the Tiger <tony@tiger.invalid> - 2012-07-22 10:29 -0500
  Re: Converting a list of strings into a list of integers? Roy Smith <roy@panix.com> - 2012-07-22 11:39 -0400
    Re: Converting a list of strings into a list of integers? Tony the Tiger <tony@tiger.invalid> - 2012-07-22 11:01 -0500
      Re: Converting a list of strings into a list of integers? Peter Otten <__peter__@web.de> - 2012-07-22 18:30 +0200
  Re: Converting a list of strings into a list of integers? Alister <alister.ware@ntlworld.com> - 2012-07-22 15:39 +0000
    Re: Converting a list of strings into a list of integers? Tony the Tiger <tony@tiger.invalid> - 2012-07-22 11:01 -0500
    Re: Converting a list of strings into a list of integers? Jan Riechers <janpeterr@freenet.de> - 2012-07-22 19:20 +0300
      Re: Converting a list of strings into a list of integers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-22 17:01 +0000
        Re: Converting a list of strings into a list of integers? Jan Riechers <janpeterr@freenet.de> - 2012-07-22 20:27 +0300
      Re: Converting a list of strings into a list of integers? Grant Edwards <invalid@invalid.invalid> - 2012-07-23 14:27 +0000
        Re: Converting a list of strings into a list of integers? rusi <rustompmody@gmail.com> - 2012-07-23 08:31 -0700
    Re: Converting a list of strings into a list of integers? David Robinow <drobinow@gmail.com> - 2012-07-22 13:03 -0400
    Re: Converting a list of strings into a list of integers? Jan Riechers <janpeterr@freenet.de> - 2012-07-22 20:10 +0300
    Re: Converting a list of strings into a list of integers? Ian Kelly <ian.g.kelly@gmail.com> - 2012-07-22 11:16 -0600
  Re: Converting a list of strings into a list of integers? Paul Rubin <no.email@nospam.invalid> - 2012-07-22 10:03 -0700
  Re: Converting a list of strings into a list of integers? Dave Angel <d@davea.name> - 2012-07-22 21:03 -0400

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