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

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Dennis Lee Bieber <wlfraed@ix.netcom.com> writes:

> On 04 Sep 2012 01:13:09 GMT, Steven D'Aprano
> <steve+comp.lang.python@pearwood.info> declaimed the following in
> gmane.comp.python.general:
> > What is the rationale for complicating [the builtin] open instead of
> > telling people to just call their opener directly?
>
> 	To avoid the new syntax would mean coding the example as
>
> 	f = os.fdopen(os.open("newfile", flags | os.O_EXCL), "w") 
>
> which does NOT look any cleaner to me... Especially not if "opener" is
> to be used in more than one location.

Exactly. That's not what was asked, though. Steven asked why not call
the opener.

So, having written the opener:

> On Mon, 03 Sep 2012 15:29:05 +0200, Christian Heimes wrote:
> > import os
> > 
> > def opener(file, flags):
> >     return os.open(file, flags | os.O_EXCL)

why not call that directly?

    f = opener(file, flags)

It certainly is cleaner than either of the alternatives so far, and it
doesn't add a parameter to the builtin.


> Furthermore, using "opener" could allow for a localized change to
> affect all open statements in the module -- change file path, open for
> string I/O rather than file I/O, etc.

I don't know of any real-life code which would be significantly improved
by that. Can you point us to some?

-- 
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Ben Finney

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Thread

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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