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Made pythonize much faster by replacing serde_json with sonic_rs #100

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9247c69
convert to sonic_rs
ppmpreetham Nov 18, 2025
cba45a1
change: readme
ppmpreetham Nov 18, 2025
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2 changes: 1 addition & 1 deletion Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,11 @@ documentation = "https://docs.rs/crate/pythonize/"
[dependencies]
serde = { version = "1.0", default-features = false, features = ["std"] }
pyo3 = { version = "0.27", default-features = false }
sonic-rs = "0.5.6"

[dev-dependencies]
serde = { version = "1.0", default-features = false, features = ["derive"] }
pyo3 = { version = "0.27", default-features = false, features = ["auto-initialize", "macros", "py-clone"] }
serde_json = "1.0"
serde_bytes = "0.11"
maplit = "1.0.2"
serde_path_to_error = "0.1.15"
2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -2,7 +2,7 @@

This is an experimental serializer for Rust's serde ecosystem, which can convert Rust objects to Python values and back.

At the moment the Python structures it produces should be _very_ similar to those which are produced by `serde_json`; i.e. calling Python's `json.loads()` on a value encoded by `serde_json` should produce an identical structure to
At the moment the Python structures it produces should be _very_ similar to those which are produced by `sonic_rs`; i.e. calling Python's `json.loads()` on a value encoded by `sonic_rs` should produce an identical structure to
that which is produced directly by `pythonize`.

## Usage
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44 changes: 22 additions & 22 deletions src/de.rs
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Expand Up @@ -522,7 +522,7 @@ mod test {
use maplit::hashmap;
use pyo3::ffi::c_str;
use pyo3::{IntoPyObject, Python};
use serde_json::{json, Value as JsonValue};
use sonic_rs::{json, Value as JsonValue};

fn test_de<T>(code: &CStr, expected: &T, expected_json: &JsonValue)
where
Expand Down Expand Up @@ -826,26 +826,26 @@ mod test {
#[test]
fn test_int_limits() {
Python::attach(|py| {
// serde_json::Value supports u64 and i64 as maximum sizes
let _: serde_json::Value = depythonize(&u8::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&u8::MIN.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i8::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i8::MIN.into_pyobject(py).unwrap()).unwrap();

let _: serde_json::Value = depythonize(&u16::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&u16::MIN.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i16::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i16::MIN.into_pyobject(py).unwrap()).unwrap();

let _: serde_json::Value = depythonize(&u32::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&u32::MIN.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i32::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i32::MIN.into_pyobject(py).unwrap()).unwrap();

let _: serde_json::Value = depythonize(&u64::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&u64::MIN.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i64::MAX.into_pyobject(py).unwrap()).unwrap();
let _: serde_json::Value = depythonize(&i64::MIN.into_pyobject(py).unwrap()).unwrap();
// sonic_rs::Value supports u64 and i64 as maximum sizes
let _: sonic_rs::Value = depythonize(&u8::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&u8::MIN.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i8::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i8::MIN.into_pyobject(py).unwrap()).unwrap();

let _: sonic_rs::Value = depythonize(&u16::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&u16::MIN.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i16::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i16::MIN.into_pyobject(py).unwrap()).unwrap();

let _: sonic_rs::Value = depythonize(&u32::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&u32::MIN.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i32::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i32::MIN.into_pyobject(py).unwrap()).unwrap();

let _: sonic_rs::Value = depythonize(&u64::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&u64::MIN.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i64::MAX.into_pyobject(py).unwrap()).unwrap();
let _: sonic_rs::Value = depythonize(&i64::MIN.into_pyobject(py).unwrap()).unwrap();

let _: u128 = depythonize(&u128::MAX.into_pyobject(py).unwrap()).unwrap();
let _: i128 = depythonize(&u128::MIN.into_pyobject(py).unwrap()).unwrap();
Expand Down Expand Up @@ -882,7 +882,7 @@ mod test {
.unwrap()
.call0()
.unwrap();
let err = depythonize::<serde_json::Value>(&obj).unwrap_err();
let err = depythonize::<sonic_rs::Value>(&obj).unwrap_err();
assert!(matches!(
*err.inner,
ErrorImpl::UnsupportedType(name) if name == "Decimal"
Expand Down
2 changes: 1 addition & 1 deletion src/ser.rs
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Expand Up @@ -647,7 +647,7 @@ mod test {
let result = result.extract::<PyBackedStr>()?;

assert_eq!(result, expected);
assert_eq!(serde_json::to_string(&src).unwrap(), expected);
assert_eq!(sonic_rs::to_string(&src).unwrap(), expected);

Ok(())
})
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2 changes: 1 addition & 1 deletion tests/test_custom_types.rs
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Expand Up @@ -11,7 +11,7 @@ use pythonize::{
PythonizeNamedMappingType, PythonizeTypes, PythonizeUnnamedMappingAdapter, Pythonizer,
};
use serde::Serialize;
use serde_json::{json, Value};
use sonic_rs::{json, Value};

#[pyclass(sequence)]
struct CustomList {
Expand Down