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Re: The opener parameter of Python 3 open() built-in

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On 9/4/2012 8:58 AM, Serhiy Storchaka wrote:
> On 04.09.12 04:13, Steven D'Aprano wrote:
>> Why does the open builtin need this added complexity? Why not just call
>> os.open directly? Or for more complex openers, just call the opener
>> directly?
>>
>> What is the rationale for complicating open instead of telling people to
>> just call their opener directly?
>
> See http://bugs.python.org/issue12797.

io.open depends on a function the returns an open file descriptor. 
opener exposes that dependency so it can be replaced. (Obviously, one 
could go crazily overboard with this idea.) I believe this is a simple 
form of dependency injection, though it might be hard to discern from 
the Java-inspired verbiage of the Wikipedia article. Part of the 
rationale in the issue is to future-proof io.open from any future needs 
for alternate fd fetching. It could also be used to decouple a test of 
io.open from os.open

-- 
Terry Jan Reedy

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The opener parameter of Python 3 open() built-in Marco <marco_u@nsgmail.com> - 2012-09-03 14:32 +0200
  Re: The opener parameter of Python 3 open() built-in Dave Angel <d@davea.name> - 2012-09-03 09:05 -0400
    Re: The opener parameter of Python 3 open() built-in Marco <marco_u@nsgmail.com> - 2012-09-03 15:33 +0200
    Re: The opener parameter of Python 3 open() built-in Marco <marco.buttu@gmail.com> - 2012-09-03 15:33 +0200
  Re: The opener parameter of Python 3 open() built-in Christian Heimes <lists@cheimes.de> - 2012-09-03 15:29 +0200
    Re: The opener parameter of Python 3 open() built-in Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-04 01:13 +0000
      Re: The opener parameter of Python 3 open() built-in Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-09-03 23:19 -0400
        Re: The opener parameter of Python 3 open() built-in Ben Finney <ben+python@benfinney.id.au> - 2012-09-04 15:12 +1000
          Re: The opener parameter of Python 3 open() built-in Ben Finney <ben+python@benfinney.id.au> - 2012-09-04 15:20 +1000
          Re: The opener parameter of Python 3 open() built-in Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-09-04 14:44 -0400
        Re: The opener parameter of Python 3 open() built-in Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-04 05:25 +0000
          Re: The opener parameter of Python 3 open() built-in Ben Finney <ben+python@benfinney.id.au> - 2012-09-04 15:45 +1000
      Re: The opener parameter of Python 3 open() built-in Serhiy Storchaka <storchaka@gmail.com> - 2012-09-04 15:58 +0300
      Re: The opener parameter of Python 3 open() built-in Terry Reedy <tjreedy@udel.edu> - 2012-09-04 15:16 -0400
      Re: The opener parameter of Python 3 open() built-in Chris Angelico <rosuav@gmail.com> - 2012-09-05 08:18 +1000
      Re: The opener parameter of Python 3 open() built-in Terry Reedy <tjreedy@udel.edu> - 2012-09-04 19:16 -0400
      Re: The opener parameter of Python 3 open() built-in Antoine Pitrou <solipsis@pitrou.net> - 2012-09-06 00:34 +0000
        Re: The opener parameter of Python 3 open() built-in Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-06 06:34 +0000
  Re: The opener parameter of Python 3 open() built-in Serhiy Storchaka <storchaka@gmail.com> - 2012-09-03 19:06 +0300
  Re: The opener parameter of Python 3 open() built-in Serhiy Storchaka <storchaka@gmail.com> - 2012-09-04 16:01 +0300

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