newbie question about subprocess.Popen() arguments

[Alex Naumov]

Hello,

I'm trying to call new process with some parameters. The problem is that the last parameter is a "string" that has a lot of spaces and different symbols like slash and so on. I can save it in file and use name of this file as parameter, but my question is: how to make it without   additional saving?

import subprocess as sp

rc = sp.Popen(["prog", "--options", "<", msg], stdin=sp.PIPE, stdout=sp.PIPE)
stdout = rc.communicate()[0]
print stdout

Thank you,

Alex

p.s.

type(msg) => <type 'str'>

[Peter Otten]

Alex Naumov wrote:

> I'm trying to call new process with some parameters. The problem is that
> the last parameter is a "string" that has a lot of spaces and different
> symbols like slash and so on. I can save it in file and use name of this
> file as parameter, but my question is: how to make it without additional
> saving?
>
> import subprocess as sp
>
> rc = sp.Popen(["prog", "--options", "<", msg], stdin=sp.PIPE,
> stdout=sp.PIPE)
> stdout = rc.communicate()[0]
> print stdout

> p.s.
> type(msg) => <type 'str'>

The < operator is a shell feature, not an argument, and msg is intended to
be send to prog's stdin. The communicate() method accepts a parameter for
that. So:

rc = sp.Popen(["prog", "--options"], stdin=sp.PIPE, stdout=sp.PIPE)
stdout = rc.communicate(msg)[0]

[Alex Naumov]

Thank you very much, Peter!

It works!

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