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passing Python assignment value to shell

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  passing Python assignment value to shell Satish Muthali <satish.muthali@gmail.com> - 2014-05-28 13:16 -0700
    Re: passing Python assignment value to shell John Gordon <gordon@panix.com> - 2014-05-28 21:40 +0000

#72191 — passing Python assignment value to shell

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Hello Experts,

I am trying to extract the available userspace+swap memory and then want to feed this value as an argument to a tool that is executed in the shell.

so, this is what I have so far:

reecalc = [s.split() for s in os.Popen("free -ht").read().splitlines()]
freecalc_total = freecalc[4]
freecalc_total = freecalc_total[3]
freecalc_total = freecalc_total.translate(None, 'M’)

Now I want to feed the value for ‘freecalc_total’ as an argument to a command executed by the shell.

For example:

devnull = open(os.devnull, “w”)
runCommand = subprocess.call([“stressapptest”, “<I want to pass the value of freecalc_total here>”, “20”],stdout=devnull,stderr=subprocess.STDOUT)
devnull.close()

How do I go about  doing this?

Many thanks in advance

-Satish

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#72194

In <mailman.10422.1401310723.18130.python-list@python.org> Satish Muthali <satish.muthali@gmail.com> writes:

> Now I want to feed the value for 'freecalc_total' as an argument to
> a command executed by the shell.

> For example:

> devnull = open(os.devnull, 'w')
> runCommand = subprocess.call(['stressapptest', '<I want to pass
> the value of freecalc_total here>'], stdout=devnull,stderr=subprocess.STDOUT)
> devnull.close()

I think you can just include freecalc_total directly as part of the
argument list, like this:

    runCommand = subprocess.call(['stressapptest', freecalc_total], 
        stdout=devnull, stderr=subprocess.STDOUT)

-- 
John Gordon         Imagine what it must be like for a real medical doctor to
gordon@panix.com    watch 'House', or a real serial killer to watch 'Dexter'.

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