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Python in SpineCreator

SpineCreator co-opts Python to allow the user to create their own connection patterns. By default, SpineCreator compiles against Python 2.7 and links to the default python library on the system.

It is possible to use an alternative installation of Python. I had need to do this because I wanted to use Numba/CUDA in some of my connection functions. I therefore wanted to use Python 3.7 from Anaconda, in which environment I had installed the CUDA tools and Numba. I've updated SpineCreator with the ability to use an alternative python. Here's what you need to do if you want to do something similar:

Compile SpineCreator against the correct libpython

First you need to compile SpineCreator against your python. In QtCreator, open up spinecreator.pro. Edit the lines where python2.7 is linked and replace with the relevant link for your python. For example, inside the linux-g++-64 section, I changed two lines:

LIBS += -L/usr/lib/graphviz -L/opt/graphviz/lib -lGLU -lpython2.7

becomes

LIBS += -L/usr/lib/graphviz -L/opt/graphviz/lib -lGLU -L/home/seb/anaconda3/lib -lpython3.7m

and

INCLUDEPATH += /usr/include/python2.7

becomes

INCLUDEPATH += /home/seb/anaconda3/include/python3.7m

Now rebuild SpineCreator.

Set up 'Python program path' and 'Python home'

Open SpineCreator. Go to Edit->Settings and choose the Python Scripts tab in the window which should appear.

In the box for 'Python program path' put in the path to your python. In my case, this is '/home/seb/anaconda3/bin/python'

In the box for 'Python home' put the right contents for PYTHONHOME for your installed python. For my Anaconda installation, it's:

/home/seb/anaconda3:/home/seb/anaconda3/bin:/home/seb/anaconda3/lib:
/home/seb/anaconda3/lib/python3.7:/home/seb/anaconda3/lib/python3.7/lib-dynload:
/home/seb/anaconda3/lib/python3.7/site-packages:
/home/seb/anaconda3/lib/python3.7/site-packages/numba:
/home/seb/anaconda3/lib/python3.7/site-packages/numba/cuda

You can see there are some site packages listed there. Google up how to find out what your PYTHONHOME is set to when you run your installed python.

Now close SpineCreator.

Run SpineCreator again, and check it launched first time

If you launch SpineCreator, and it doesn't appear; check the Application Output window in QtCreator. It may tell you it crashed. Perhaps you didn't compile SpineCreator against the correct Python library.

If SpineCreator appears, congratulations. Now go and check the settings window again and make sure that 'Python program path' and 'Python home' are still set to the expected values.

You should now find that your Python scripts in SpineCreator are executed by the correct, non-standard Python installation.