Hi Tony,

 

You recently made a change which prevents me using the library in an embedded Python interpreter.

 

In pythonengine.cs, you “inject” decorators with the following code:

 

//=================================================================

public static void Initialize() {

.....

IntPtr globals = Runtime.PyEval_GetGlobals();

PyDict locals = new PyDict();

try

{

    IntPtr builtins = Runtime.PyEval_GetBuiltins();

    Runtime.PyDict_SetItemString(locals.Handle, "__builtins__", builtins);

 

    var assembly = Assembly.GetExecutingAssembly();

    using (Stream stream = assembly.GetManifestResourceStream("Python.Runtime.resources.clr.py"))

    using (StreamReader reader = new StreamReader(stream))

    {

        // add the contents of clr.py to the module

        string clr_py = reader.ReadToEnd();

        PyObject result = RunString(clr_py, globals, locals.Handle);

        if (null == result)

            throw new PythonException();

        result.Dispose();

    }

//=================================================================

When running from a Python script, it’s fine because the Python interpreter has already been initialized and global variables have been defined.

 

The issue is that when running from an embedded interpreter. As I must first initialize the Python engine using PythonEngine.Initialize().

 

So when we reach this piece of code, there is no script running, no “Python context”, so “PyEval_GetGlobals” returns null and “RunString” fails.

 

We could create an artificial global dictionary but it won’t be available to the rest of the code.

 

I think it should be best to move this code into a Python module. If run from a script (PyEval_GetGlobals() != null), you could inject the decorators with a simple “from decorators_pythonnet import *”. If run from an embedded interpreter, we could add a line for running the same code once the engine has been initialized.

 

What do you think?

 

Serge Weinstock

 

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