swift

f612e901 - [iterator] Use iter and next to loop through Python Object (TF-337) (#23268)

[iterator] Use iter and next to loop through Python Object (TF-337) (#23268) This adds iterator support for iterating through a `PythonObject`. Makes `PythonObject` conform to `Sequence`. Resolves [TF-337](https://bugs.swift.org/browse/TF-337).