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Description
Environment
- Pythonnet version: 3.0.5
- Python version: 3.10
- Operating System: Windows 11
- .NET Runtime: .NET Framework 4.7.2
Details
I have a C# object that I pass into python, and I am trying to implement some python builtins on the C# class. This works fine for some methods, like __repr__() or __dir__(), but runs into issues with __getattribute__. This is an issue as I would like to implement __getattr__ or __getattribute__ for the purposes of customizing attribute access in python for some of my .NET types.https://docs.python.org/3/reference/datamodel.html#object.__getattribute__
I have created a demo C# console application to demonstrate my problem:
MyClass.cs:
namespace pythonnet_demo{ internal class MyClass { public object __repr__() { return "Test repr!"; } public object __getattribute__(string name) { return "__getattribute__ works!"; } }}Program.cs:
using Python.Runtime;using System.IO;namespace pythonnet_demo{ internal class Program { static void Main(string[] args) { string pythonHome = @"C:\dev\python"; Runtime.PythonDLL = Path.Combine(pythonHome, "python310.dll"); PythonEngine.PythonHome = pythonHome; PythonEngine.Initialize(); MyClass obj = new MyClass(); using (Py.GIL()) { PyModule _scope = Py.CreateScope("__main__"); _scope.Set("obj", obj); //Test repr, works as expected, "Test repr!" printed to console _scope.Exec("print(repr(obj))"); //Test __getattribute__, throws exception, 'AttributeError', no attribute X _scope.Exec("print(obj.X)"); } } }}As noted in the above comments, the __repr__() method from MyClass.cs runs properly from python, but not the __getattribute__ method.
If I create a script.py file and just run it normally via python I do get the expected result.
class MyClassPy: def __repr__(self): return "Test repr!" def __getattribute__(self, name): return "__getattribute__ works!"obj = MyClassPy()print(repr(obj))print(obj.X)The above script prints to the console as expected when run (output below), unlike C# where only the repr method is executed.
Test repr!__getattribute__ works!Why doesn't this work from C#? Am I missing something?
Note: I have tried changing the parameters, eg usingobject name instead ofstring name in MyClass.cs, same result.