About getter generates new instances

[minsungkim-qraft]

Let's consider following code.

#[pyclass]
pub struct Container {
    #[pyo3(get)]
    pub internal: Vec<i64>,
}

#[pymethods]
impl Container {
    #[staticmethod]
    pub fn dummy() -> PyResult<Self> {
        Ok(Container { internal: (0..10).collect() })
    }
}

and imagine if you try to manipulate Container::internal in Python.

container = Container.dummy()
print(container.internal)
container.internal.append(10)
print(container.internal)

and if you run the code, you will see identical two lines on the terminal. In other words, 10 is not appended.

1. Is this identical to this troubleshooting issue?
2. Is this also same for Rust enums decorated by pyclass? In Python, every Enum instance is unique, that is, a is b is always true if a and b are same enum object. However, if PyO3 clones same enum objects then this might be false, so I wondered. If PyO3 is cloning same enum object(therefore a is b == False), could you please elaborate why?

[davidhewitt]

Sorry for the slow reply. In answer to your questions:

1. Yes, it is equivalent to the FAQ issue.
2. At the moment PyO3 does not create enum singletons but that is actively being worked on. See Comparing enums by identity #3059.