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Re: [Discuss-gnuradio] Unable to build gr-wxgui on Mac OS X 10.6.1

From: Michael Dickens
Subject: Re: [Discuss-gnuradio] Unable to build gr-wxgui on Mac OS X 10.6.1
Date: Thu, 15 Jul 2010 07:58:02 -0600

On Jul 15, 2010, at 5:54 AM, Bruhtesfa Ebrahim wrote:
It is kind of confusing. I have Gnuradio installed, so executing the
gnuradio examples in their own directory works fine. But, from the home
directory..it restult in:

$ python dial_tone.py
/opt/local/Library/Frameworks/Python.framework/Versions/2.6/ Resources/Python.app/Contents/MacOS/Python:

can't open file 'dial_tone.py': [Errno 2] No such file or directory
Let me see if I understand what you've written correctly:

* You installed GNU Radio in the standard way: bootstrap, configure, make, make install. That means the examples ended up at "/usr/local/ share/gnuradio/examples", and in particular the one you mention at "/ usr/local/share/gnuradio/examples/audio/dial_tone.py".

* "PYTHONPATH=/opt/local/lib/python2.6/site-packages:/usr/local/lib/ python2.6/site-packages" for your shell environment.

* When your shell's directory has been changed "cd /usr/local/share/ gnuradio/examples/audio" and you then do "python dial_tone.py" it works for you.

* When your shell's directory is it's "home" (typically on OSX "/Users/ FOO", where FOO is your username; also called "~"), then issuing the same command ("python dial_tone.py") does not work for you because the script is not found.

All of the above is normal behavior for Linux and pretty much any UNIX flavor including OSX, and it sounds like GNU Radio is installed correctly.

The issue is that the script "dial_tone.py" is not in the search path that Python knows (via the PYTHONPATH & what else is built in to Python). If you do issue "python -c 'import sys; print sys.path'" you'll see what Python thinks of as its search path. The first entry is probably '', which corresponds to "." or the directory from which Python was called. After that are the directories listed in PYTHONPATH, and then the rest are those stored in the Python install at compile-time.

If you want to execute the script you mention from your home directory, you'll need to reference it directly, e.g., "python /usr/ local/share/gnuradio/examples/audio/dial_tone.py" should work. Or, if you want to use that script a lot from other locations, you can always add its directory to the PYTHONPATH; it'd recommend doing it at the end, via adding ":/usr/local/share/gnuradio/examples/audio" to what's already there.

Also of note: As with Linux and other UNIX flavors, on OSX you generally don't actually need the "python" declaration in front of the file so long as the file is marked executable. As with your example, if you do "ls -l /usr/local/share/gnuradio/examples/audio/ dial_tone.py" it should come back marked as "x" for everyone (meaning: executable). Hence you could just do "/usr/local/share/gnuradio/ examples/audio/dial_tone.py" from anywhere, or "cd /usr/local/share/ gnuradio/examples/audio && ./dial_tone.py" and it should function correctly. Even GUI Python scripts should work correctly without the "pythonw" in front -- though there will be a few stubborn ones that will complain.

Hope this helps! - MLD

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