Environment

• Pythonnet version: V2.5.1.
• Python version: V3.8.4 64 bit
• Operating System: Windows 10 64 bit

Details

1. Run the following code in a console application with Visual Studio.

using (Py.GIL())
{

    var script = "a=b\n";
    try
    {
        PythonEngine.Exec(script);
    }
    catch (PythonException ex)
    {
        try
        {
            var m = ex.Format();
        }
        catch (Exception exception)
        {
            var t = exception.GetType();
            var s = exception.Message;
        }
    }
}

Since "a=b" is invalid, I expected an error message like so returned by ex.Format():

Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'b' is not defined

However, Format() throws another PythonException - "AttributeError : 'str' object has no attribute 'cause'" with the following stack trace - list(TracebackException(\n', ' File "C:\Python38\Lib\traceback.py", line 479, in init\n if (exc_value and exc_value.cause is not None\n'] .