Re: [Discuss-gnuradio] How to call .py file into another .py file

[Michael Berman]

Yes, there is.  Try the "subprocess.Popen" command in python (http://docs.python.org/library/subprocess.html).  The one thing in this code that you will need to modify slightly is in the calls to set up the pipes, you need to to use "subprocess.PIPE" instead of simply "PIPE".

At this point, you could use the pipe to communicate to the other process both ways.  The easiest way I have found for this is with the "os.read(...)" and "os.write(...)" commands.  One thing about the os.write and os.read commands is that for the first parameter you will need the file descriptor number, not the file descriptor.

To get this, lets say you assign the subprocess to "p"; in order to get the file number in order to talk to the child process, you would type in "p.stdin.fileno()" to write to the process, or "p.stdout.fileno()" to read from the process.  Another simple way to write to a process at startup is to pass it arguments.

Here is some source code that shows how to do this (http://code.google.com/p/softwaredefinedradio/source/browse/trunk/src/FFT/get_fft.py).  On line 40, this shows how to dynamically assign arguments to a child process with the subprocess.Popen command, as well as how to read in the arguments very simply on lines 7, 15, 23, 31 with the use of the argv array (mind you that argv[0] is the process name).  This example also shows how to use the os.write on lines 42 and 43.

Thanks,
Michael B.

On Tue, Jan 26, 2010 at 7:04 PM, Muhammad Ali Khan <address@hidden> wrote:

Thanks for your suggestions guys. But i think i didn't convey myself properly. Right now i want to fetch out the gain at some frequency using (usrp_wfm_rcv.py) in a loop in which i can change my frequency in every iteration. is there any way i can get it.

Thanks

Ali

On Tue, Jan 26, 2010 at 3:23 PM, Josef Vukovic <address@hidden> wrote:

Hello,

That's not a good python textbook, it is more like a quick start guide. I would suggest him
"Learning python 4th edition" from Mark Lutz.

http://oreilly.com/catalog/9780596158071

yours faithful

Josef Vukovic

 

2010/1/26 Eric Blossom <address@hidden>

On Tue, Jan 26, 2010 at 02:51:36PM -0500, Muhammad Ali Khan wrote:
> hi guy,
>
> I am facing some problem. I want to execute a (.py) extension file into
> another (.py) extension file. i am tired of searching on websites but didn't
> get any satisfactory results. Is it possible or is there any other way of
> doing this. can anyone help please.
>
> Ali

I suggest starting with the Python Tutorial:

 http://docs.python.org/tutorial

Or in pdf:

 http://docs.python.org/download.html

Eric

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-Michael Berman