Rust 判断对象是 PyDatetime 还是 Pydate 的实例

这是我的main.rs%文件:

use pyo3::prelude::*;
use pyo3::types::{PyDateTime, PyDate};

fn main() -> () {
    Python::with_gil(|py| {
        let datetime = py.import("datetime").unwrap();
        let my_datetime = datetime.call_method1("datetime", (2022, 3, 28, 0, 0, 0, 0)).unwrap();
        println!("isinstance pydatetime: {:?}", my_datetime.is_instance_of::<PyDateTime>().unwrap());
        println!("isinstance pydate: {:?}", my_datetime.is_instance_of::<PyDate>().unwrap());

        let my_date = datetime.call_method1("date", (2022, 3, 28)).unwrap();
        println!("isinstance pydatetime: {:?}", my_date.is_instance_of::<PyDateTime>().unwrap());
        println!("isinstance pydate: {:?}", my_date.is_instance_of::<PyDate>().unwrap());
    })
}

这是我的Cargo.toml%文件:

[package]
name = "tmp"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
pyo3 = { version = "0.18.0", features = ["auto-initialize"] }

如果我运行上面的命令，我会得到

isinstance pydatetime: true
isinstance pydate: true
isinstance pydatetime: true
isinstance pydate: true

我觉得这有点奇怪，因为直接在Python中运行时，我会得到:

In [27]: import datetime as dt

In [28]: isinstance(my_datetime, dt.datetime)
Out[28]: True

In [29]: isinstance(my_datetime, dt.date)
Out[29]: True

In [30]: isinstance(my_date, dt.datetime)
Out[30]: False

In [31]: isinstance(my_date, dt.date)
Out[31]: True

所以，我本以为

my_date.is_instance_of::<PyDateTime>().unwrap()

也要活到false岁

为什么不是这样，我如何区分一个对象是datetime还是date，而不求助于更麻烦的方法，比如判断dt.get_type().name()？