Hi, I have a Windows application that has been using Boost Python for many
years now, and we are looking to upgrade from Python 3.7 to Python 3.12. This
is a C++ application written in Qt5 that uses Boost Python to interface with
Python scripts that do some scientific calculations, and the results are
displayed in the C++ application. As such, these calculations are by and large
done on a concurrent thread so as not to block the UI; however, some quick
python functions are run from the main thread.
The problem is that *something* changed in the Python 3.12 upgrade, and I'm not
sure what -- but now it crashes when I run Python code from a different thread
from the one I called Py_Initialize() on. I've tested up to Python 3.11, and I
can Py_Initialize() on the main thread and call Python code from any thread and
everything works. But starting in Python 3.12, that's no longer the case. If I
initialize Python on the UI thread, I can only run it from that thread. If I
initialize it on a concurrent thread, I can only run it on a concurrent thread.
Since I am using Python, Qt5, and Boost Python, I am not 100% sure where the
fault lies, but I am posting this here in case anyone has run into this issue.
I haven't found any other references to it online. I can post a minimal example
project if that would be helpful for debugging. Essentially, this is the meat
of my code:
//Initialization Function:
Py_Initialize();
//Boost Python Code:
boost::python::object main = boost::python::import("__main__");
boost::python::object name_space(main.attr("__dict__"));
boost::python::exec_file("testPython.py", name_space, name_space);
double testNumber = boost::python::extract<double>(name_space["testNumber"]);
qDebug() << testNumber; //print(testNumber)
#testPython.py:
import random
testNumber = random.random()
Thanks for any help you can provide.
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