Re: [Discuss-gnuradio] Running flowgraphs from command line

[Michael Dickens]

Hi Patrick - You're on the right track. We're just following what is written (roughly) in < http://gnuradio.org/redmine/projects/gnuradio/wiki/MacInstall >. Please also note that unless you play some tricks with the +quartz variant that is available many GR dependencies, you'll have to install XQuartz.app to get any GUI working (see also http://gnuradio.org/redmine/projects/gnuradio/wiki/MacInstall#Prerequisite-X11app-recommended-via-XQuartz ). Your shell env looks good; because MP's Python internally set their PYTHONPATH, you won't need to so long as you use MP-provided GR projects (e.g., gr-fosphor). If you want to do your own out-of-tree builds, you can install them pretty much anywhere so long as the libraries are linked correctly and PYTHONPATH is set correctly to wherever your OOT Python module is installed. 

 

You ask a variety of questions about Python usage in OSX. Apple provides Python 2.6 and 2.7 in /usr/bin in most modern OSX versions; in MP, you can get Python 2.7, 3.4, and 3.5rc3. MP does not provide the other Python versions because there really is no use case for them any longer : 2.7 supersedes 2.6, just as 3.4 does with 3.[0-3]; 3.5 when it is released should supersede 3.4, so we'll likely push end users to 

 

As to your question as to which 'python' is selected for use and when: The times it matters is when 'python' is issued either in a shell or in a script via "env python". In this case, the first 'python' found in the shell PATH is used. Thus, issuing "sudo port select python python27" means that, more often than not, 'python' will result in the MP version (2.7) being executed. Which in general is OK. When you need to use the OSX system one you can always do that by either removing /opt/local/bin from PATH or by specifying "env /usr/bin/python"; there are other ways too. But, as a general use-case having "which python" result in /opt/local/bin/python is not a bad idea.

 

-That said-, you should never rely on a specific "python" being the one you expect it to be. If you want a specific Python, you'll red to test for it or just specify it up front, e.g., "/opt/local/bin/python2.7".

 

Hope this continues to help! - MLD

 

On Tue, Sep 8, 2015, at 03:34 AM, Patrick Krämer wrote:

Hey Michael, Hey Kevin, Hey all,

 

thanks for your help!

I found that by specifying the python version I want to use when running the file, everything works fine. Like this:

 

python2.7 if_else_mod.py 

 

This would be acceptable for me, however, I decided to do some of the stuff you suggested. I get the following output when running env:

 

Patricks-iMac:~ patrick$ env

TERM_PROGRAM=Apple_Terminal

SHELL=/bin/bash

TERM=xterm-256color

TMPDIR=/var/folders/3j/qy7_9bpx29g_nf_ymbkw_td00000gn/T/

Apple_PubSub_Socket_Render=/private/tmp/com.apple.launchd.11PeMdZFpD/Render

TERM_PROGRAM_VERSION=343.7

TERM_SESSION_ID=1FC9A988-7B1E-4869-95D3-5FF71F9942F7

USER=patrick

SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.0PyXsYlSwi/Listeners

__CF_USER_TEXT_ENCODING=0x1F5:0x0:0x3

PATH=/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin

PWD=/Users/patrick

DBUS_LAUNCHD_SESSION_BUS_SOCKET=/private/tmp/com.apple.launchd.dJkzL2MOo1/unix_domain_listener

LANG=de_DE.UTF-8

XPC_FLAGS=0x0

XPC_SERVICE_NAME=0

SHLVL=1

HOME=/Users/patrick

LOGNAME=patrick

DISPLAY=/private/tmp/com.apple.launchd.KWH6aSklFz/org.macosforge.xquartz:0

_=/usr/bin/env

 

 

I see that I only have a PATH variable set, but no PYTHONPATH. And /opt/local/bin seems to be the first in place?! With

 

Patricks-iMac:bin patrick$ pwd

/usr/bin

Patricks-iMac:bin patrick$ ./py

pydoc             python            python2.6-config  pythonw

pydoc2.6          python-config     python2.7         pythonw2.6

pydoc2.7          python2.6         python2.7-config  pythonw2.7

 

I see that I have even more python installs. Now I ran

 

Patricks-iMac:bin patrick$ which python

/usr/bin/python

Patricks-iMac:bin patrick$ port select --list python

Available versions for python:

none (active)

python26-apple

python27

python27-apple

 

So terminal normally would run "python" (didn’t look up the version). And MacPorts?

All this is what comes out of a clean OS X 10.9 install with an update to 10.10 and then a GNURadio install via MacPorts. Didn’t try yet to change one of the env variables or use the 'sudo port select python python27‘ command. What would your suggestions now be? What I don’t understand is why I have to tell MacPorts to use python2.7, if in fact I want to tell that to my terminal?