Re: Best way to rewrite Popen

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From	Cecil Westerhof <Cecil@decebal.nl>
Newsgroups	comp.lang.python
Subject	Re: Best way to rewrite Popen
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Date	Tue, 19 May 2015 21:13:39 +0200
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Op Tuesday 19 May 2015 19:36 CEST schreef Jon Ribbens:

> On 2015-05-19, Cecil Westerhof <Cecil@decebal.nl> wrote:
>> At the moment I am playing with things like: p =
>> subprocess.Popen('ls -l', shell = True, stdout = subprocess.PIPE)
>>
>> I think that most of the times this are the values I want. So it
>> would be nice to overrule the defaults. What is the best way to do
>> this? So creating a function that is exactly the same except for
>> the defaults for shell and stdout (and maybe stderr).
>
> Yes.
>
> def shellprocess(cmd, **kwargs):
> return subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE,
> **kwargs)

Will that not go wrong if I call it with?
    shellprocess('ls -1', shell = False)


>> It is a little less important as I first thought, because I found
>> the following: error, output = subprocess.getstatusoutput('ls -1')
>> files_new = output.splitlines() But it is still nice to know.
>
> Why are you doing this anyway, rather than using os.listdir()?
> Invoking subprocesses via the shell is very rarely a good idea.

I want to rewrite a Bash script into a Python script. The 'ls -1' is
only an example. But Popen and listdir give a different output. The
sorting is different. But I could sort it myself.

Another problem is that I work with a filter later on. But I could do
that with Python also of-course. So maybe I should rethink what I want
to do. ;-)

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

Thread

Best way to rewrite Popen Cecil Westerhof <Cecil@decebal.nl> - 2015-05-19 19:01 +0200
  Re: Best way to rewrite Popen Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2015-05-19 17:36 +0000
    Re: Best way to rewrite Popen Cecil Westerhof <Cecil@decebal.nl> - 2015-05-19 21:13 +0200
      Re: Best way to rewrite Popen Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2015-05-19 20:14 +0000
      Re: Best way to rewrite Popen Cecil Westerhof <Cecil@decebal.nl> - 2015-05-19 22:19 +0200
        Re: Best way to rewrite Popen Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2015-05-19 21:28 +0000
          Re: Best way to rewrite Popen Cecil Westerhof <Cecil@decebal.nl> - 2015-05-20 00:23 +0200
            Re: Best way to rewrite Popen MRAB <python@mrabarnett.plus.com> - 2015-05-20 00:20 +0100
              Re: Best way to rewrite Popen Cecil Westerhof <Cecil@decebal.nl> - 2015-05-20 02:15 +0200
  Re: Best way to rewrite Popen Jonas Wielicki <jonas@wielicki.name> - 2015-05-19 19:43 +0200
  Re: Best way to rewrite Popen Chris Angelico <rosuav@gmail.com> - 2015-05-20 03:47 +1000
  Re: Best way to rewrite Popen Zachary Ware <zachary.ware+pylist@gmail.com> - 2015-05-19 12:55 -0500
  Re: Best way to rewrite Popen Chris Angelico <rosuav@gmail.com> - 2015-05-20 04:13 +1000
  Re: Best way to rewrite Popen Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-05-20 03:23 +0200

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