IronPython - "AttributeError: object has no attribute" with custom classes

Question

This seems like there is just a simple error that I cannot figure out. I am using IronPython in a C# WPF application and am getting the following error when trying to run a function from a custom C# class:AttributeError: 'MyScriptingFunctions' object has no attribute 'Procedure'.

The python script I'm running is very simple and has two lines. Line 1 executes fine, the error occurs on line 2.

    txt.Text = "some text"
    MyFunc.Procedure(5)

MyScriptingFunctions.cs:

class MyScriptingFunctions
{
    public MyScriptingFunctions() {}

    public void Procedure(int num)
    {
        Console.WriteLine("Executing procedure " + num); 
    }
}

Here is how I setup the IronPython engine:

     private void btnRunScript_Click(object sender, RoutedEventArgs e)
     {
        MyScriptingFunctions scriptFuncs = new MyScriptingFunctions();
        ScriptEngine engine = Python.CreateEngine();
        ScriptScope scope = engine.CreateScope();

        ScriptRuntime runtime = engine.Runtime;
        runtime.LoadAssembly(typeof(String).Assembly);
        runtime.LoadAssembly(typeof(Uri).Assembly);

        //Set Variable for the python script to use
        scope.SetVariable("txt", fullReadResultsTextBox);
        scope.SetVariable("MyFunc", scriptFuncs);
        string code = this.scriptTextBox.Text;
        try
        {
            ScriptSource source = engine.CreateScriptSourceFromString(code, SourceCodeKind.Statements);
            source.Execute(scope);
        }
        catch (Exception ex)
        {
            ExceptionOperations eo;
            eo = engine.GetService<ExceptionOperations>();
            string error = eo.FormatException(ex);

            MessageBox.Show(error, "There was an Error");
            return;
        }

    }

I am simply setting two variables:txt which is of type System.Windows.Controls.TextBox, and MyFunc which is an object of my custom class MyScriptingFunctions.

What am I doing wrong and why does the python script execute the TextBox methods correctly and not my custom class's methods?

Jeff Hardy · Accepted Answer · 2013-06-19 21:45:47Z

8

The only think I can see that might be an issue, or just a copy-paste error, is that the MyScriptingFunctions in not public. That shouldn't be an issue because you're passing an instance in, not trying to import the class, but it's worth a try. Otherwise everything looks fine.

answered Jun 19, 2013 at 21:45

Jeff Hardy

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2 Comments

benjamin.popp Over a year ago

Had same issue, hadn't thought to make the class public. For others stuck with this issue: your class does not need to be public, but the method needs to be public enough to be seen outside the assembly. For example, you can have an internal class that implements a public interface, so long as python only calls the interface methods.

s.m. Over a year ago

I can confirm, run into this issue a minute ago. Thanks.

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