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Merge pull request #2273 from PyO3/dog-food-intern

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Make use of intern! macro for attribute names used internally
This commit is contained in:
David Hewitt 2022-04-05 00:41:35 +01:00 committed by GitHub
parent d3ac71a42b f02a060a3d
commit 9774a7c1c1
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 102 additions and 16 deletions
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13
pyo3-macros-backend/src/frompyobject.rs
View file

@ -294,8 +294,10 @@ impl<'a> Container<'a> {
let mut fields: Punctuated<TokenStream, syn::Token![,]> = Punctuated::new();
for (ident, attrs) in tups {
let getter = match &attrs.getter {
FieldGetter::GetAttr(Some(name)) => quote!(getattr(#name)),
FieldGetter::GetAttr(None) => quote!(getattr(stringify!(#ident))),
FieldGetter::GetAttr(Some(name)) => quote!(getattr(_pyo3::intern!(py, #name))),
FieldGetter::GetAttr(None) => {
quote!(getattr(_pyo3::intern!(py, stringify!(#ident))))
}
FieldGetter::GetItem(Some(key)) => quote!(get_item(#key)),
FieldGetter::GetItem(None) => quote!(get_item(stringify!(#ident))),
};
@ -303,13 +305,14 @@ impl<'a> Container<'a> {
format!("failed to extract field {}.{}", quote!(#self_ty), ident);
let get_field = quote!(obj.#getter?);
let extractor = match &attrs.from_py_with {
None => quote!(
#get_field.extract().map_err(|inner| {
None => quote!({
let py = _pyo3::PyNativeType::py(obj);
#get_field.extract().map_err(|inner| {
let new_err = _pyo3::exceptions::PyTypeError::new_err(#conversion_error_msg);
new_err.set_cause(py, ::std::option::Option::Some(inner));
new_err
})?),
})?
}),
Some(FromPyWithAttribute {
value: expr_path, ..
}) => quote! (

38
src/instance.rs
View file

@ -534,6 +534,25 @@ impl<T> Py<T> {
/// Retrieves an attribute value.
///
/// This is equivalent to the Python expression `self.attr_name`.
///
/// If calling this method becomes performance-critical, the [`intern!`] macro can be used
/// to intern `attr_name`, thereby avoiding repeated temporary allocations of Python strings.
///
/// # Example: `intern!`ing the attribute name
///
/// ```
/// # use pyo3::{intern, pyfunction, types::PyModule, IntoPy, Py, Python, PyObject, PyResult};
/// #
/// #[pyfunction]
/// fn version(sys: Py<PyModule>, py: Python<'_>) -> PyResult<PyObject> {
/// sys.getattr(py, intern!(py, "version"))
/// }
/// #
/// # Python::with_gil(|py| {
/// # let sys = py.import("sys").unwrap().into_py(py);
/// # version(sys, py).unwrap();
/// # });
/// ```
pub fn getattr<N>(&self, py: Python<'_>, attr_name: N) -> PyResult<PyObject>
where
N: ToPyObject,
@ -546,6 +565,25 @@ impl<T> Py<T> {
/// Sets an attribute value.
///
/// This is equivalent to the Python expression `self.attr_name = value`.
///
/// If calling this method becomes performance-critical, the [`intern!`] macro can be used
/// to intern `attr_name`, thereby avoiding repeated temporary allocations of Python strings.
///
/// # Example: `intern!`ing the attribute name
///
/// ```
/// # use pyo3::{intern, pyfunction, types::PyModule, IntoPy, PyObject, Python, PyResult};
/// #
/// #[pyfunction]
/// fn set_answer(ob: PyObject, py: Python<'_>) -> PyResult<()> {
/// ob.setattr(py, intern!(py, "answer"), 42)
/// }
/// #
/// # Python::with_gil(|py| {
/// # let ob = PyModule::new(py, "empty").unwrap().into_py(py);
/// # set_answer(ob, py).unwrap();
/// # });
/// ```
pub fn setattr<N, V>(&self, py: Python<'_>, attr_name: N, value: V) -> PyResult<()>
where
N: ToPyObject,

38
src/types/any.rs
View file

@ -111,6 +111,25 @@ impl PyAny {
/// Retrieves an attribute value.
///
/// This is equivalent to the Python expression `self.attr_name`.
///
/// If calling this method becomes performance-critical, the [`intern!`] macro can be used
/// to intern `attr_name`, thereby avoiding repeated temporary allocations of Python strings.
///
/// # Example: `intern!`ing the attribute name
///
/// ```
/// # use pyo3::{intern, pyfunction, types::PyModule, PyAny, Python, PyResult};
/// #
/// #[pyfunction]
/// fn version(sys: &PyModule) -> PyResult<&PyAny> {
/// sys.getattr(intern!(sys.py(), "version"))
/// }
/// #
/// # Python::with_gil(|py| {
/// # let sys = py.import("sys").unwrap();
/// # version(sys).unwrap();
/// # });
/// ```
pub fn getattr<N>(&self, attr_name: N) -> PyResult<&PyAny>
where
N: ToPyObject,
@ -124,6 +143,25 @@ impl PyAny {
/// Sets an attribute value.
///
/// This is equivalent to the Python expression `self.attr_name = value`.
///
/// If calling this method becomes performance-critical, the [`intern!`] macro can be used
/// to intern `attr_name`, thereby avoiding repeated temporary allocations of Python strings.
///
/// # Example: `intern!`ing the attribute name
///
/// ```
/// # use pyo3::{intern, pyfunction, types::PyModule, PyAny, Python, PyResult};
/// #
/// #[pyfunction]
/// fn set_answer(ob: &PyAny) -> PyResult<()> {
/// ob.setattr(intern!(ob.py(), "answer"), 42)
/// }
/// #
/// # Python::with_gil(|py| {
/// # let ob = PyModule::new(py, "empty").unwrap();
/// # set_answer(ob).unwrap();
/// # });
/// ```
pub fn setattr<N, V>(&self, attr_name: N, value: V) -> PyResult<()>
where
N: ToBorrowedObject,

21
src/types/module.rs
View file

@ -8,8 +8,7 @@ use crate::exceptions;
use crate::ffi;
use crate::pyclass::PyClass;
use crate::type_object::PyTypeObject;
use crate::types::PyCFunction;
use crate::types::{PyAny, PyDict, PyList};
use crate::types::{PyAny, PyCFunction, PyDict, PyList, PyString};
use crate::{AsPyPointer, IntoPy, PyObject, Python};
use std::ffi::{CStr, CString};
use std::str;
@ -168,12 +167,13 @@ impl PyModule {
///
/// `__all__` declares the items that will be imported with `from my_module import *`.
pub fn index(&self) -> PyResult<&PyList> {
match self.getattr("__all__") {
let __all__ = __all__(self.py());
match self.getattr(__all__) {
Ok(idx) => idx.downcast().map_err(PyErr::from),
Err(err) => {
if err.is_instance_of::<exceptions::PyAttributeError>(self.py()) {
let l = PyList::empty(self.py());
self.setattr("__all__", l).map_err(PyErr::from)?;
self.setattr(__all__, l).map_err(PyErr::from)?;
Ok(l)
} else {
Err(err)
@ -202,7 +202,6 @@ impl PyModule {
/// May fail if the module does not have a `__file__` attribute.
#[cfg(not(all(windows, PyPy)))]
pub fn filename(&self) -> PyResult<&str> {
use crate::types::PyString;
unsafe {
self.py()
.from_owned_ptr_or_err::<PyString>(ffi::PyModule_GetFilenameObject(self.as_ptr()))?
@ -304,7 +303,7 @@ impl PyModule {
{
let py = self.py();
let function = wrapper(py).convert(py)?;
let name = function.getattr(py, "__name__")?;
let name = function.getattr(py, __name__(py))?;
let name = name.extract(py)?;
self.add(name, function)
}
@ -389,11 +388,19 @@ impl PyModule {
/// [1]: crate::prelude::pyfunction
/// [2]: crate::wrap_pyfunction
pub fn add_function<'a>(&'a self, fun: &'a PyCFunction) -> PyResult<()> {
let name = fun.getattr("__name__")?.extract()?;
let name = fun.getattr(__name__(self.py()))?.extract()?;
self.add(name, fun)
}
}
fn __all__(py: Python<'_>) -> &PyString {
intern!(py, "__all__")
}
fn __name__(py: Python<'_>) -> &PyString {
intern!(py, "__name__")
}
#[cfg(test)]
mod tests {
use crate::{types::PyModule, Python};

2
src/types/typeobject.rs
View file

@ -37,7 +37,7 @@ impl PyType {
/// Gets the name of the `PyType`.
pub fn name(&self) -> PyResult<&str> {
self.getattr("__qualname__")?.extract()
self.getattr(intern!(self.py(), "__qualname__"))?.extract()
}
/// Checks whether `self` is a subclass of `other`.