Dear Allin,
I think Gretl is ignoring the path to Python executable in OS X (El
Capitan). I trying to use a different version of Python (2.7.11) and
Gretl is running the old one (2.7.10) that is supplied by Apple.
I tried three different paths (under GUI "Tools -> Preferences General
-> Programs"):
(1) "/Applications/Python 2.7/IDLE.app/Contents/MacOS/Python"
(2) "/Library/Frameworks/Python.framework/Versions/2.7/bin/python"
(3) "" (empty!)
And executed the following commands:
<python>
import sys
print (sys.version)
</python>
Best,
Henrique Andrade