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Re: how to change os.popen4 to subprocess

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On 2012-10-27 03:28, skyworld wrote:
> Hi,
>
> I'm new to python and I'm trying to porting some scripts from v0.96 to
> v2.0.1. A piece of code is like this:
>
> cmd_h = os.popen4(env['SYSCMDLINE'])[1]
>
> the system indicates the popen4 is deprecated and suggest to use
> subprocess. Can anybody tell me how to use subprocess in this case?
> and what does "[1]" here means?
>
os.popen4 returns a tuple of (child_stdin, child_stdout_and_stderr).
The [1] gets the child_stdout_and_stderr member.

Using the subprocess module:

# Untested!
cmd_h = subprocess.Popen(env['SYSCMDLINE'], stdout=subprocess.PIPE, 
stderr=subprocess.STDOUT, shell=True).stdout

Explanation:

The command line: env['SYSCMDLINE']

Return stdout: stdout=subprocess.PIPE

stderr should be combined with stdout: stderr=subprocess.STDOUT

Let the shell parse the command line: shell=True

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how to change os.popen4 to subprocess skyworld <chenyong20000@gmail.com> - 2012-10-26 19:28 -0700
  Re: how to change os.popen4 to subprocess MRAB <python@mrabarnett.plus.com> - 2012-10-27 04:02 +0100
    Re: how to change os.popen4 to subprocess skyworld <chenyong20000@gmail.com> - 2012-10-26 23:30 -0700
      RE: how to change os.popen4 to subprocess "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-10-30 14:47 +0000
  Re: how to change os.popen4 to subprocess Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-10-27 04:10 +0100

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