calling programs from python

[RR]

Hello,

I am trying to call a program in python as I would call it in the command
line. For example I want to do the following from python: command > file.
Then read this file. How do I call "command > file" ? Much help
appreciated.

-RR

[David MacQuigg]

Re: calling programs from python

On Mon, 01 Dec 2003 19:27:34 -0500, "RR" <ergodicsum@yah oo.com> wrote:
[color=blue]
>Hello,
>
>I am trying to call a program in python as I would call it in the command
>line. For example I want to do the following from python: command > file.
>Then read this file. How do I call "command > file" ? Much help
>appreciated.[/color]

Use os.system() For example, on Unix:[color=blue][color=green][color=darkred]
>>> import os
>>> os.system( 'command > file' )[/color][/color][/color]
and on Windows:[color=blue][color=green][color=darkred]
>>> os.system('star t C:\Python23\pyt hon.exe')[/color][/color][/color]

-- Dave

[Kristofer Wouk]

Re: calling programs from python

David MacQuigg wrote:[color=blue]
> On Mon, 01 Dec 2003 19:27:34 -0500, "RR" <ergodicsum@yah oo.com> wrote:
>
>[color=green]
>>Hello,
>>
>>I am trying to call a program in python as I would call it in the command
>>line. For example I want to do the following from python: command > file.
>>Then read this file. How do I call "command > file" ? Much help
>>appreciated .[/color]
>
>
> Use os.system() For example, on Unix:
>[color=green][color=darkred]
>>>>import os
>>>>os.system ( 'command > file' )[/color][/color]
>
> and on Windows:
>[color=green][color=darkred]
>>>>os.system(' start C:\Python23\pyt hon.exe')[/color][/color]
>
>
> -- Dave[/color]
This will work too:

import os
os.popen('comma nd > file')

Kris

[David MacQuigg]

Re: calling programs from python

On Tue, 02 Dec 2003 16:02:26 GMT, Kristofer Wouk
<kristofer@hotp op.com> wrote:
[...][color=blue]
>import os
>os.popen('comm and > file')[/color]

This is a little confusing. Do you intend the output from 'command'
to go to 'file' or to the pipe you just opened?

If you are opening a pipe (to be read as a file object) I would
suggest something like this:
[color=blue][color=green][color=darkred]
>>> import os
>>> file = os.popen('cat makefile | grep pyuic')
>>> file.readlines( )[/color][/color][/color]
['\tpyuic ModelSelector.u i > ModelSelector.p y\n']

If you are just executing a command and not needing to process any
output from the command (other than its completion status), I would
stick with the more general:
[color=blue][color=green][color=darkred]
>>> import os
>>> status = os.system('comm and > file')
>>> status
>>> 0
>>>[/color][/color][/color]

--Dave

[Richard James]

Re: calling programs from python

David MacQuigg <shuvit@127.0.0 .1> wrote in message news:<k04osvscn cmln06m83nam6jg hrpjg79jd7@4ax. com>...[color=blue]
> On Mon, 01 Dec 2003 19:27:34 -0500, "RR" <ergodicsum@yah oo.com> wrote:
>[color=green]
> >Hello,
> >
> >I am trying to call a program in python as I would call it in the command
> >line. For example I want to do the following from python: command > file.
> >Then read this file. How do I call "command > file" ? Much help
> >appreciated.[/color]
>
> Use os.system() For example, on Unix:[color=green][color=darkred]
> >>> import os
> >>> os.system( 'command > file' )[/color][/color]
> and on Windows:[color=green][color=darkred]
> >>> os.system('star t C:\Python23\pyt hon.exe')[/color][/color]
>
> -- Dave[/color]

Windows Python os module has os.startfile()

os.startfile('C :\Python23\pyth on.exe')

-- Richard