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Re: Supply condition in function call

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From Ian Kelly <ian.g.kelly@gmail.com>
Date Wed, 25 Mar 2015 14:49:08 -0600
Subject Re: Supply condition in function call
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On Wed, Mar 25, 2015 at 1:53 PM, Grant Edwards <invalid@invalid.invalid> wrote:
> On 2015-03-25, Ian Kelly <ian.g.kelly@gmail.com> wrote:
>> On Wed, Mar 25, 2015 at 11:29 AM, Manuel Graune <manuel.graune@koeln.de> wrote:
>>
>>> I'm looking for a way to supply a condition to an if-statement inside a
>>> function body when calling the function. I can sort of get what I want
>>> with using eval [...]
>>
>> Pass the condition as a function.
>>
>> def test1(a, b, condition=lambda i, j: True):
>>     for i,j in zip(a,b):
>>         c=i+j
>>         if condition(i, j):
>>             print("Foo")
>>
>> test1([0,1,2,3],[1,2,3,4], lambda i, j: i+j > 4)
>> # etc.
>
> FWIW, back in the day such a function was referred to as a "thunk"
> (particularly if it was auto-generated by a compiler that used
> pass-by-name instead of pass-by-value or pass-by-reference):
>
>   http://en.wikipedia.org/wiki/Thunk
>
> Dunno if people still use that term or not.

I've heard the term (though not since my college days, I think), but
I've always understood thunks to be parameterless (hence the use as a
form of pass-by-name).

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Supply condition in function call Manuel Graune <manuel.graune@koeln.de> - 2015-03-25 18:29 +0100
  Re: Supply condition in function call Joel Goldstick <joel.goldstick@gmail.com> - 2015-03-25 13:41 -0400
    Re: Supply condition in function call Manuel Graune <manuel.graune@koeln.de> - 2015-03-25 18:51 +0100
      Re: Supply condition in function call Joel Goldstick <joel.goldstick@gmail.com> - 2015-03-25 14:17 -0400
      Re: Supply condition in function call Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 12:22 -0600
      Re: Supply condition in function call Joel Goldstick <joel.goldstick@gmail.com> - 2015-03-25 14:42 -0400
  Re: Supply condition in function call Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 11:44 -0600
    Re: Supply condition in function call Grant Edwards <invalid@invalid.invalid> - 2015-03-25 19:53 +0000
      Re: Supply condition in function call Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 14:49 -0600
        Re: Supply condition in function call Grant Edwards <invalid@invalid.invalid> - 2015-03-26 15:41 +0000
  Re: Supply condition in function call Terry Reedy <tjreedy@udel.edu> - 2015-03-25 14:50 -0400
  Re: Supply condition in function call Gary Herron <gherron@digipen.edu> - 2015-03-25 12:13 -0700
    Re: Supply condition in function call Rustom Mody <rustompmody@gmail.com> - 2015-03-25 21:02 -0700
      Re: Supply condition in function call Chris Angelico <rosuav@gmail.com> - 2015-03-26 17:00 +1100
        Re: Supply condition in function call Rustom Mody <rustompmody@gmail.com> - 2015-03-26 18:41 -0700
          Re: Supply condition in function call Chris Angelico <rosuav@gmail.com> - 2015-03-27 12:56 +1100
            Re: Supply condition in function call Rustom Mody <rustompmody@gmail.com> - 2015-03-26 19:21 -0700
              Re: Supply condition in function call Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-27 15:34 +1100
                Re: Supply condition in function call Rustom Mody <rustompmody@gmail.com> - 2015-03-27 06:48 -0700
                Re: Supply condition in function call Chris Angelico <rosuav@gmail.com> - 2015-03-28 01:17 +1100
                Re: Supply condition in function call Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-03-27 16:00 +0000
                Re: Supply condition in function call Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-28 18:32 +1100
                Re: Supply condition in function call Chris Angelico <rosuav@gmail.com> - 2015-03-28 18:45 +1100
            Re: Supply condition in function call Larry Hudson <orgnut@yahoo.com> - 2015-03-27 17:26 -0700
              Re: Supply condition in function call Rustom Mody <rustompmody@gmail.com> - 2015-03-27 18:27 -0700
              Re: Supply condition in function call Marko Rauhamaa <marko@pacujo.net> - 2015-03-28 09:50 +0200
                Re: Supply condition in function call Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-28 20:17 +1100
                Re: Supply condition in function call Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-28 03:19 -0600
                Re: Supply condition in function call Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-28 20:57 +1100
                Re: Supply condition in function call Cameron Simpson <cs@zip.com.au> - 2015-03-30 09:35 +1100
                Re: Supply condition in function call Manuel Graune <manuel.graune@koeln.de> - 2015-03-30 00:46 +0200
          Re: Supply condition in function call Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 20:25 -0600
            Re: Supply condition in function call Rustom Mody <rustompmody@gmail.com> - 2015-03-26 19:46 -0700
    Re: Supply condition in function call Manuel Graune <manuel.graune@koeln.de> - 2015-03-26 07:27 +0100
      Re: Supply condition in function call Cameron Simpson <cs@zip.com.au> - 2015-03-26 18:06 +1100
        Re: Supply condition in function call Manuel Graune <manuel.graune@koeln.de> - 2015-03-27 21:02 +0100
          Re: Supply condition in function call Cameron Simpson <cs@zip.com.au> - 2015-03-28 09:55 +1100
      Re: Supply condition in function call Peter Otten <__peter__@web.de> - 2015-03-26 10:03 +0100
        Re: Supply condition in function call Manuel Graune <manuel.graune@koeln.de> - 2015-03-27 20:46 +0100
          Re: Supply condition in function call Peter Otten <__peter__@web.de> - 2015-03-27 21:38 +0100
  Re: Supply condition in function call smap <askme.first@thankyouverymuch.invalid> - 2015-03-28 08:58 +0000

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