pyo3/tests/test_pyfunction.rs

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#![cfg(feature = "macros")]
use std::collections::HashMap;
#[cfg(not(Py_LIMITED_API))]
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use pyo3::buffer::PyBuffer;
use pyo3::prelude::*;
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#[cfg(not(Py_LIMITED_API))]
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use pyo3::types::PyDateTime;
#[cfg(not(any(Py_LIMITED_API, PyPy)))]
use pyo3::types::PyFunction;
use pyo3::types::{self, PyCFunction};
mod common;
#[pyfunction(signature = (arg = true))]
fn optional_bool(arg: Option<bool>) -> String {
format!("{:?}", arg)
}
#[test]
fn test_optional_bool() {
// Regression test for issue #932
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Python::with_gil(|py| {
let f = wrap_pyfunction!(optional_bool)(py).unwrap();
py_assert!(py, f, "f() == 'Some(true)'");
py_assert!(py, f, "f(True) == 'Some(true)'");
py_assert!(py, f, "f(False) == 'Some(false)'");
py_assert!(py, f, "f(None) == 'None'");
});
}
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#[cfg(not(Py_LIMITED_API))]
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#[pyfunction]
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fn buffer_inplace_add(py: Python<'_>, x: PyBuffer<i32>, y: PyBuffer<i32>) {
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let x = x.as_mut_slice(py).unwrap();
let y = y.as_slice(py).unwrap();
for (xi, yi) in x.iter().zip(y) {
let xi_plus_yi = xi.get() + yi.get();
xi.set(xi_plus_yi);
}
}
#[cfg(not(Py_LIMITED_API))]
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#[test]
fn test_buffer_add() {
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Python::with_gil(|py| {
let f = wrap_pyfunction!(buffer_inplace_add)(py).unwrap();
py_expect_exception!(
py,
f,
r#"
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import array
a = array.array("i", [0, 1, 2, 3])
b = array.array("I", [0, 1, 2, 3])
f(a, b)
"#,
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PyBufferError
);
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pyo3::py_run!(
py,
f,
r#"
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import array
a = array.array("i", [0, 1, 2, 3])
b = array.array("i", [2, 3, 4, 5])
f(a, b)
assert a, array.array("i", [2, 4, 6, 8])
"#
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);
});
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}
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#[cfg(not(any(Py_LIMITED_API, PyPy)))]
#[pyfunction]
fn function_with_pyfunction_arg(fun: &PyFunction) -> PyResult<&PyAny> {
fun.call((), None)
}
#[pyfunction]
fn function_with_pycfunction_arg(fun: &PyCFunction) -> PyResult<&PyAny> {
fun.call((), None)
}
#[test]
fn test_functions_with_function_args() {
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Python::with_gil(|py| {
let py_cfunc_arg = wrap_pyfunction!(function_with_pycfunction_arg)(py).unwrap();
let bool_to_string = wrap_pyfunction!(optional_bool)(py).unwrap();
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pyo3::py_run!(
py,
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py_cfunc_arg
bool_to_string,
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r#"
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assert py_cfunc_arg(bool_to_string) == "Some(true)"
"#
);
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#[cfg(not(any(Py_LIMITED_API, PyPy)))]
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{
let py_func_arg = wrap_pyfunction!(function_with_pyfunction_arg)(py).unwrap();
pyo3::py_run!(
py,
py_func_arg,
r#"
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def foo(): return "bar"
assert py_func_arg(foo) == "bar"
"#
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);
}
});
}
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#[cfg(not(Py_LIMITED_API))]
fn datetime_to_timestamp(dt: &PyAny) -> PyResult<i64> {
let dt: &PyDateTime = dt.extract()?;
let ts: f64 = dt.call_method0("timestamp")?.extract()?;
Ok(ts as i64)
}
#[cfg(not(Py_LIMITED_API))]
#[pyfunction]
fn function_with_custom_conversion(
#[pyo3(from_py_with = "datetime_to_timestamp")] timestamp: i64,
) -> i64 {
timestamp
}
#[cfg(not(Py_LIMITED_API))]
#[test]
fn test_function_with_custom_conversion() {
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Python::with_gil(|py| {
let custom_conv_func = wrap_pyfunction!(function_with_custom_conversion)(py).unwrap();
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pyo3::py_run!(
py,
custom_conv_func,
r#"
import datetime
dt = datetime.datetime.fromtimestamp(1612040400)
assert custom_conv_func(dt) == 1612040400
"#
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)
});
}
#[cfg(not(Py_LIMITED_API))]
#[test]
fn test_function_with_custom_conversion_error() {
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Python::with_gil(|py| {
let custom_conv_func = wrap_pyfunction!(function_with_custom_conversion)(py).unwrap();
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py_expect_exception!(
py,
custom_conv_func,
"custom_conv_func(['a'])",
PyTypeError,
"argument 'timestamp': 'list' object cannot be converted to 'PyDateTime'"
);
});
}
#[test]
fn test_from_py_with_defaults() {
fn optional_int(x: &PyAny) -> PyResult<Option<i32>> {
if x.is_none() {
Ok(None)
} else {
Some(x.extract()).transpose()
}
}
// issue 2280 combination of from_py_with and Option<T> did not compile
#[pyfunction]
fn from_py_with_option(#[pyo3(from_py_with = "optional_int")] int: Option<i32>) -> i32 {
int.unwrap_or(0)
}
#[pyfunction(signature = (len=0))]
fn from_py_with_default(#[pyo3(from_py_with = "PyAny::len")] len: usize) -> usize {
len
}
Python::with_gil(|py| {
let f = wrap_pyfunction!(from_py_with_option)(py).unwrap();
assert_eq!(f.call0().unwrap().extract::<i32>().unwrap(), 0);
assert_eq!(f.call1((123,)).unwrap().extract::<i32>().unwrap(), 123);
assert_eq!(f.call1((999,)).unwrap().extract::<i32>().unwrap(), 999);
let f2 = wrap_pyfunction!(from_py_with_default)(py).unwrap();
assert_eq!(f2.call0().unwrap().extract::<usize>().unwrap(), 0);
assert_eq!(f2.call1(("123",)).unwrap().extract::<usize>().unwrap(), 3);
assert_eq!(f2.call1(("1234",)).unwrap().extract::<usize>().unwrap(), 4);
});
}
#[pyclass]
#[derive(Debug, FromPyObject)]
struct ValueClass {
#[pyo3(get)]
value: usize,
}
#[pyfunction]
fn conversion_error(
str_arg: &str,
int_arg: i64,
tuple_arg: (&str, f64),
option_arg: Option<i64>,
struct_arg: Option<ValueClass>,
) {
println!(
"{:?} {:?} {:?} {:?} {:?}",
str_arg, int_arg, tuple_arg, option_arg, struct_arg
);
}
#[test]
fn test_conversion_error() {
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Python::with_gil(|py| {
let conversion_error = wrap_pyfunction!(conversion_error)(py).unwrap();
py_expect_exception!(
py,
conversion_error,
"conversion_error(None, None, None, None, None)",
PyTypeError,
"argument 'str_arg': 'NoneType' object cannot be converted to 'PyString'"
);
py_expect_exception!(
py,
conversion_error,
"conversion_error(100, None, None, None, None)",
PyTypeError,
"argument 'str_arg': 'int' object cannot be converted to 'PyString'"
);
py_expect_exception!(
py,
conversion_error,
"conversion_error('string1', 'string2', None, None, None)",
PyTypeError,
"argument 'int_arg': 'str' object cannot be interpreted as an integer"
);
py_expect_exception!(
py,
conversion_error,
"conversion_error('string1', -100, 'string2', None, None)",
PyTypeError,
"argument 'tuple_arg': 'str' object cannot be converted to 'PyTuple'"
);
py_expect_exception!(
py,
conversion_error,
"conversion_error('string1', -100, ('string2', 10.), 'string3', None)",
PyTypeError,
"argument 'option_arg': 'str' object cannot be interpreted as an integer"
);
let exception = py_expect_exception!(
py,
conversion_error,
"
class ValueClass:
def __init__(self, value):
self.value = value
conversion_error('string1', -100, ('string2', 10.), None, ValueClass(\"no_expected_type\"))",
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PyTypeError
);
assert_eq!(
extract_traceback(py, exception),
"TypeError: argument 'struct_arg': failed to \
extract field ValueClass.value: TypeError: 'str' object cannot be interpreted as an integer"
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);
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let exception = py_expect_exception!(
py,
conversion_error,
"
class ValueClass:
def __init__(self, value):
self.value = value
conversion_error('string1', -100, ('string2', 10.), None, ValueClass(-5))",
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PyTypeError
);
assert_eq!(
extract_traceback(py, exception),
"TypeError: argument 'struct_arg': failed to \
extract field ValueClass.value: OverflowError: can't convert negative int to unsigned"
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);
});
}
/// Helper function that concatenates the error message from
/// each error in the traceback into a single string that can
/// be tested.
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fn extract_traceback(py: Python<'_>, mut error: PyErr) -> String {
let mut error_msg = error.to_string();
while let Some(cause) = error.cause(py) {
error_msg.push_str(": ");
error_msg.push_str(&cause.to_string());
error = cause
}
error_msg
}
#[test]
fn test_pycfunction_new() {
use pyo3::ffi;
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Python::with_gil(|py| {
unsafe extern "C" fn c_fn(
_self: *mut ffi::PyObject,
_args: *mut ffi::PyObject,
) -> *mut ffi::PyObject {
ffi::PyLong_FromLong(4200)
}
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let py_fn = PyCFunction::new(
c_fn,
"py_fn",
"py_fn for test (this is the docstring)",
py.into(),
)
.unwrap();
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py_assert!(py, py_fn, "py_fn() == 4200");
py_assert!(
py,
py_fn,
"py_fn.__doc__ == 'py_fn for test (this is the docstring)'"
);
});
}
#[test]
fn test_pycfunction_new_with_keywords() {
use pyo3::ffi;
use std::ffi::CString;
use std::os::raw::{c_char, c_long};
use std::ptr;
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Python::with_gil(|py| {
unsafe extern "C" fn c_fn(
_self: *mut ffi::PyObject,
args: *mut ffi::PyObject,
kwds: *mut ffi::PyObject,
) -> *mut ffi::PyObject {
let mut foo: c_long = 0;
let mut bar: c_long = 0;
let foo_ptr: *mut c_long = &mut foo;
let bar_ptr: *mut c_long = &mut bar;
let foo_name = CString::new("foo").unwrap();
let foo_name_raw: *mut c_char = foo_name.into_raw();
let kw_bar_name = CString::new("kw_bar").unwrap();
let kw_bar_name_raw: *mut c_char = kw_bar_name.into_raw();
let mut arglist = vec![foo_name_raw, kw_bar_name_raw, ptr::null_mut()];
let arglist_ptr: *mut *mut c_char = arglist.as_mut_ptr();
let arg_pattern: *const c_char = CString::new("l|l").unwrap().into_raw();
ffi::PyArg_ParseTupleAndKeywords(
args,
kwds,
arg_pattern,
arglist_ptr,
foo_ptr,
bar_ptr,
);
ffi::PyLong_FromLong(foo * bar)
}
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let py_fn = PyCFunction::new_with_keywords(
c_fn,
"py_fn",
"py_fn for test (this is the docstring)",
py.into(),
)
.unwrap();
py_assert!(py, py_fn, "py_fn(42, kw_bar=100) == 4200");
py_assert!(py, py_fn, "py_fn(foo=42, kw_bar=100) == 4200");
py_assert!(
py,
py_fn,
"py_fn.__doc__ == 'py_fn for test (this is the docstring)'"
);
});
}
#[test]
fn test_closure() {
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Python::with_gil(|py| {
let f = |args: &types::PyTuple, _kwargs: Option<&types::PyDict>| -> PyResult<_> {
Python::with_gil(|py| {
let res: Vec<_> = args
.iter()
.map(|elem| {
if let Ok(i) = elem.extract::<i64>() {
(i + 1).into_py(py)
} else if let Ok(f) = elem.extract::<f64>() {
(2. * f).into_py(py)
} else if let Ok(mut s) = elem.extract::<String>() {
s.push_str("-py");
s.into_py(py)
} else {
panic!("unexpected argument type for {:?}", elem)
}
})
.collect();
Ok(res)
})
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};
let closure_py =
PyCFunction::new_closure(py, Some("test_fn"), Some("test_fn doc"), f).unwrap();
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py_assert!(py, closure_py, "closure_py(42) == [43]");
py_assert!(py, closure_py, "closure_py.__name__ == 'test_fn'");
py_assert!(py, closure_py, "closure_py.__doc__ == 'test_fn doc'");
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py_assert!(
py,
closure_py,
"closure_py(42, 3.14, 'foo') == [43, 6.28, 'foo-py']"
);
});
}
#[test]
fn test_closure_counter() {
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Python::with_gil(|py| {
let counter = std::cell::RefCell::new(0);
let counter_fn =
move |_args: &types::PyTuple, _kwargs: Option<&types::PyDict>| -> PyResult<i32> {
let mut counter = counter.borrow_mut();
*counter += 1;
Ok(*counter)
};
let counter_py = PyCFunction::new_closure(py, None, None, counter_fn).unwrap();
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py_assert!(py, counter_py, "counter_py() == 1");
py_assert!(py, counter_py, "counter_py() == 2");
py_assert!(py, counter_py, "counter_py() == 3");
});
}
#[test]
fn use_pyfunction() {
mod function_in_module {
use pyo3::prelude::*;
#[pyfunction]
pub fn foo(x: i32) -> i32 {
x
}
}
Python::with_gil(|py| {
use function_in_module::foo;
// check imported name can be wrapped
let f = wrap_pyfunction!(foo, py).unwrap();
assert_eq!(f.call1((5,)).unwrap().extract::<i32>().unwrap(), 5);
assert_eq!(f.call1((42,)).unwrap().extract::<i32>().unwrap(), 42);
// check path import can be wrapped
let f2 = wrap_pyfunction!(function_in_module::foo, py).unwrap();
assert_eq!(f2.call1((5,)).unwrap().extract::<i32>().unwrap(), 5);
assert_eq!(f2.call1((42,)).unwrap().extract::<i32>().unwrap(), 42);
})
}
#[pyclass]
struct Key(String);
#[pyclass]
struct Value(i32);
#[pyfunction]
fn return_value_borrows_from_arguments<'py>(
py: Python<'py>,
key: &'py Key,
value: &'py Value,
) -> HashMap<&'py str, i32> {
py.allow_threads(move || {
let mut map = HashMap::new();
map.insert(key.0.as_str(), value.0);
map
})
}
#[test]
fn test_return_value_borrows_from_arguments() {
Python::with_gil(|py| {
let function = wrap_pyfunction!(return_value_borrows_from_arguments, py).unwrap();
let key = Py::new(py, Key("key".to_owned())).unwrap();
let value = Py::new(py, Value(42)).unwrap();
py_assert!(py, function key value, "function(key, value) == { \"key\": 42 }");
});
}