Breaking change handling Arrow Tz (implementing Chrono Tz) in 0.23.4

[kylebarron]

Bug Description

This code compiles fine in 0.23.3 but fails to compile in 0.23.4.

`Option<chrono::datetime::DateTime<Tz>>` cannot be converted to a Python object
the following trait bounds were not satisfied:
`Option<chrono::datetime::DateTime<Tz>>: pyo3::IntoPyObject<'_>`
which is required by `Option<chrono::datetime::DateTime<Tz>>: IntoPyObjectExt<'_>`
`&Option<chrono::datetime::DateTime<Tz>>: pyo3::IntoPyObject<'_>`
which is required by `&Option<chrono::datetime::DateTime<Tz>>: IntoPyObjectExt<'_>`
`&mut Option<chrono::datetime::DateTime<Tz>>: pyo3::IntoPyObject<'_>`
which is required by `&mut Option<chrono::datetime::DateTime<Tz>>: IntoPyObjectExt<'_>`
`IntoPyObject` is automatically implemented by the `#[pyclass]` macro
if you do not wish to have a corresponding Python type, implement it manually
if you do not own `Option<chrono::datetime::DateTime<Tz>>` you can perform a manual conversion to one of the types in `pyo3::types::*`

This is an Option<DateTime<Tz>>

This seems to be related to #3266, #4790 (cc @bschoenmaeckers)

Steps to Reproduce

Simplified, this code:

use arrow_array::timezone::Tz;
use chrono::DateTime;
use pyo3::prelude::*;
use pyo3::IntoPyObjectExt;

fn datetime_to_pyobject(py: Python, dt: DateTime<Tz>) -> PyResult<PyObject> {
    dt.into_py_any(py)
}

compiles in 0.23.3 but does not compile in 0.23.4.

Backtrace

Your operating system and version

MacOS 15.3

Your Python version (python --version)

3.11

Your Rust version (rustc --version)

rustc 1.84.0 (9fc6b4312 2025-01-07)

Your PyO3 version

0.23.3/0.23.4

How did you install python? Did you use a virtualenv?

From uv.

Additional Info

No response

[bschoenmaeckers]

Sorry for breaking your usecase. The issue is that arrow_array::timezone::Tz does not implement IntoPyObject which we require now to correctly convert non-fixed-offset timezones. To get the old behaviour you can convert the arrow_array::timezone::Tz timezone to a fixed timezone before converting. e.g. datetime.fixed_offset().into_py_any(py).

I have also created a PR which removes the IntoPyObject constraint on Tz.