PySet is not iterable

[samuelcolvin]

As per the docs (and reproduced with pyo3 v0.8.5, python 3.7, ubuntu) PySet is not an iterator.

Therefore for element in my_set { throws an error.

I tried wrapping the set in PyList::new but got the trait std::iter::ExactSizeIterator is not implemented for &pyo3::types::PySet.

Is there a good reason to prevent iteration over sets? If not could it be added, also is there a workaround for now?

[davidhewitt]

It seems to me that it is reasonable for PySet to implement this. (Have opened a PR.)

For now you can use for element in my_set.iter()? { thanks to the ObjectProtocol trait.

[samuelcolvin]

PySet.iter isn't documented as it is on PyList.

But thank you.