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Re: semicolon at end of python's statements

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On Fri, Aug 30, 2013 at 5:15 PM, Antoon Pardon
<antoon.pardon@rece.vub.ac.be> wrote:
> Op 30-08-13 06:55, Ben Finney schreef:
>> Ben Finney <ben+python@benfinney.id.au> writes:
>>
>>> Fábio Santos <fabiosantosart@gmail.com> writes:
>>>
>>>> It is a shame that this is not possible in python. for..if exists in
>>>> comprehensions and not in regular loops but that would be nice
>>>> sometimes.
>>>     for foo in (spam for spam in sequence if predicate(spam)): …
>>
>> Better:
>>
>>     for foo in filter(predicate, sequence):
>>         process(foo)
>
> Well better in what way? You now have to translate a predicate
> expression into a predicate function. Which AFAIU was one of
> the reasons to move away from map/filter to list comprehension.
>
> As I understand it, python made a move away from map and filter
> towards list comprehension. Chris seems to want some of the
> possibilities that came with that incorporated into the for
> statement. And your suggestion is to go back to the old kind
> of filter way.

No, actually Ben's quite right - assuming the predicate is a simple
function, of course (Python's lambda notation is a bit clunky for
comparisons); as of Python 3, filter() is lazy and is pretty much what
I'm doing here. However, that's still a specific answer to a specific
(albeit common) instance of wanting to merge control structures.

ChrisA

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Re: semicolon at end of python's statements "Sam Fourman Jr." <sfourman@gmail.com> - 2013-08-28 22:10 -0400
  Re: semicolon at end of python's statements Alister <alister.ware@ntlworld.com> - 2013-08-29 09:39 +0000
    Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-29 19:52 +1000
    Re: semicolon at end of python's statements Fábio Santos <fabiosantosart@gmail.com> - 2013-08-29 11:02 +0100
    Re: semicolon at end of python's statements Ben Finney <ben+python@benfinney.id.au> - 2013-08-30 08:17 +1000
    Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-30 08:50 +1000
    Re: semicolon at end of python's statements Ben Finney <ben+python@benfinney.id.au> - 2013-08-30 14:55 +1000
    Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-08-30 09:15 +0200
    Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-30 17:25 +1000
    Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-08-30 09:48 +0200
    Re: semicolon at end of python's statements Fábio Santos <fabiosantosart@gmail.com> - 2013-08-30 11:32 +0100
      Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-08-30 06:53 -0400
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-08-30 16:14 +0200
        Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-31 08:18 +1000
      Re: semicolon at end of python's statements Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-31 00:09 +0000
        Re: semicolon at end of python's statements Terry Reedy <tjreedy@udel.edu> - 2013-08-31 01:03 -0400
        Re: semicolon at end of python's statements Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-08-31 10:47 +0300
          Re: semicolon at end of python's statements Paul Rudin <paul.nospam@rudin.co.uk> - 2013-08-31 09:00 +0100
            Re: semicolon at end of python's statements Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-08-31 13:28 +0300
            Re: semicolon at end of python's statements Grant Edwards <invalid@invalid.invalid> - 2013-09-02 14:20 +0000
              Re: semicolon at end of python's statements Tim Chase <python.list@tim.thechases.com> - 2013-09-02 09:45 -0500
                Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-09-02 10:47 -0400
                Re: semicolon at end of python's statements Tim Chase <python.list@tim.thechases.com> - 2013-09-02 12:58 -0500
                Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-09-03 07:07 +1000
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-01 19:58 +0200
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-01 21:58 +0200
          Re: semicolon at end of python's statements Steven D'Aprano <steve@pearwood.info> - 2013-09-02 08:05 +0000
            Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 11:45 +0200
            Re: semicolon at end of python's statements Fábio Santos <fabiosantosart@gmail.com> - 2013-09-02 11:42 +0100
            Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 12:58 +0200
            Re: semicolon at end of python's statements "albert visser" <albert.visser@gmail.com> - 2013-09-02 19:44 +0200
              Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-09-02 13:53 -0400
                Re: semicolon at end of python's statements Neil Cerutti <neilc@norwich.edu> - 2013-09-03 17:15 +0000
                Re: semicolon at end of python's statements Neil Cerutti <neilc@norwich.edu> - 2013-09-03 20:00 +0000
            Re: semicolon at end of python's statements Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-09-02 17:24 -0400
        Re: semicolon at end of python's statements MRAB <python@mrabarnett.plus.com> - 2013-09-02 00:30 +0100
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 10:29 +0200
          Re: semicolon at end of python's statements Steven D'Aprano <steve@pearwood.info> - 2013-09-02 09:52 +0000
            Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-09-02 20:14 +1000
              Re: semicolon at end of python's statements Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-02 14:57 +0000
            Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 12:52 +0200
            Re: semicolon at end of python's statements Modulok <modulok@gmail.com> - 2013-09-02 17:17 -0600
              Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-09-02 19:54 -0400
                Re: semicolon at end of python's statements Modulok <modulok@gmail.com> - 2013-09-02 18:56 -0600

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