判断对象是 PyDatetime 还是 Pydate 的实例？

Question

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：

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());
    })
}

如果我运行上面的代码，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，我得到：

[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"] }

所以，我本来期望

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

也成为false

为什么情况并非如此，我如何区分一个对象是否是一个对象datetime，而date无需诉诸更多的黑客方法（例如检查）dt.get_type().name()？

Answer 1

我已向 PyO3 提交了一个拉取请求，应该可以解决此问题： https: //github.com/PyO3/pyo3/pull/3071

diff --git a/src/types/datetime.rs b/src/types/datetime.rs
index 85860728568..2c995356e2c 100644
--- a/src/types/datetime.rs
+++ b/src/types/datetime.rs
@@ -228,7 +228,7 @@ pub struct PyDateTime(PyAny);
 pyobject_native_type!(
     PyDateTime,
     crate::ffi::PyDateTime_DateTime,
-    *ensure_datetime_api(Python::assume_gil_acquired()).DateType,
+    *ensure_datetime_api(Python::assume_gil_acquired()).DateTimeType,
     #module=Some("datetime"),
     #checkfunction=PyDateTime_Check
 );