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TestConverter.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using NUnit.Framework;
using Python.Runtime;
using PyRuntime = Python.Runtime.Runtime;
namespace Python.EmbeddingTest
{
public class TestConverter
{
static readonly Type[] _numTypes = new Type[]
{
typeof(short),
typeof(ushort),
typeof(int),
typeof(uint),
typeof(long),
typeof(ulong)
};
[Test]
public void TestConvertSingleToManaged(
[Values(float.PositiveInfinity, float.NegativeInfinity, float.MinValue, float.MaxValue, float.NaN,
float.Epsilon)] float testValue)
{
var pyFloat = new PyFloat(testValue);
object convertedValue;
var converted = Converter.ToManaged(pyFloat, typeof(float), out convertedValue, false);
Assert.That(converted, Is.True);
Assert.That(((float)convertedValue).Equals(testValue), Is.True);
}
[Test]
public void TestConvertDoubleToManaged(
[Values(double.PositiveInfinity, double.NegativeInfinity, double.MinValue, double.MaxValue, double.NaN,
double.Epsilon)] double testValue)
{
var pyFloat = new PyFloat(testValue);
object convertedValue;
var converted = Converter.ToManaged(pyFloat, typeof(double), out convertedValue, false);
Assert.That(converted, Is.True);
Assert.That(((double)convertedValue).Equals(testValue), Is.True);
}
[Test]
public void CovertTypeError()
{
Type[] floatTypes = new Type[]
{
typeof(float),
typeof(double)
};
using (var s = new PyString("abc"))
{
foreach (var type in _numTypes.Union(floatTypes))
{
object value;
try
{
bool res = Converter.ToManaged(s, type, out value, true);
Assert.That(res, Is.False);
var bo = Exceptions.ExceptionMatches(Exceptions.TypeError);
Assert.That(Exceptions.ExceptionMatches(Exceptions.TypeError)
|| Exceptions.ExceptionMatches(Exceptions.ValueError), Is.True);
}
finally
{
Exceptions.Clear();
}
}
}
}
[Test]
public void ConvertOverflow()
{
using (var num = new PyInt(ulong.MaxValue))
{
using var largeNum = PyRuntime.PyNumber_Add(num, num);
try
{
object value;
foreach (var type in _numTypes)
{
bool res = Converter.ToManaged(largeNum.BorrowOrThrow(), type, out value, true);
Assert.That(res, Is.False);
Assert.That(Exceptions.ExceptionMatches(Exceptions.OverflowError), Is.True);
Exceptions.Clear();
}
}
finally
{
Exceptions.Clear();
}
}
}
[Test]
public void NoImplicitConversionToBool()
{
var pyObj = new PyList(items: new[] { 1.ToPython(), 2.ToPython() }).ToPython();
Assert.Throws<InvalidCastException>(() => pyObj.As<bool>());
}
[Test]
public void ToNullable()
{
const int Const = 42;
var i = new PyInt(Const);
var ni = i.As<int?>();
Assert.That(ni, Is.EqualTo(Const));
}
[Test]
public void BigIntExplicit()
{
BigInteger val = 42;
var i = new PyInt(val);
var ni = i.As<BigInteger>();
Assert.That(ni, Is.EqualTo(val));
var nullable = i.As<BigInteger?>();
Assert.That(nullable, Is.EqualTo(val));
}
[Test]
public void PyIntImplicit()
{
var i = new PyInt(1);
var ni = (PyObject)i.As<object>();
Assert.That(PythonReferenceComparer.Instance.Equals(i, ni), Is.True);
}
[Test]
public void ToPyList()
{
var list = new PyList();
list.Append("hello".ToPython());
list.Append("world".ToPython());
var back = list.ToPython().As<PyList>();
Assert.That(back.Length(), Is.EqualTo(list.Length()));
}
[Test]
public void RawListProxy()
{
var list = new List<string> {"hello", "world"};
var listProxy = PyObject.FromManagedObject(list);
var clrObject = (CLRObject)ManagedType.GetManagedObject(listProxy);
Assert.AreSame(list, clrObject.inst);
}
[Test]
public void RawPyObjectProxy()
{
var pyObject = "hello world!".ToPython();
var pyObjectProxy = PyObject.FromManagedObject(pyObject);
var clrObject = (CLRObject)ManagedType.GetManagedObject(pyObjectProxy);
Assert.AreSame(pyObject, clrObject.inst);
#pragma warning disable CS0612 // Type or member is obsolete
const string handlePropertyName = nameof(PyObject.Handle);
#pragma warning restore CS0612 // Type or member is obsolete
var proxiedHandle = pyObjectProxy.GetAttr(handlePropertyName).As<IntPtr>();
Assert.That(proxiedHandle, Is.EqualTo(pyObject.DangerousGetAddressOrNull()));
}
[Test]
public void GenericToPython()
{
int i = 42;
var pyObject = i.ToPythonAs<IConvertible>();
var type = pyObject.GetPythonType();
Assert.That(type.Name, Is.EqualTo(nameof(IConvertible)));
}
// regression for https://github.com/pythonnet/pythonnet/issues/451
[Test]
public void CanGetListFromDerivedClass()
{
using var scope = Py.CreateScope();
scope.Import(typeof(GetListImpl).Namespace, asname: "test");
scope.Exec(@"
class PyGetListImpl(test.GetListImpl):
pass
");
var pyImpl = scope.Get("PyGetListImpl");
dynamic inst = pyImpl.Invoke();
List<string> result = inst.GetList();
Assert.That(result, Is.EqualTo(new[] { "testing" }).AsCollection);
}
}
public interface IGetList
{
List<string> GetList();
}
public class GetListImpl : IGetList
{
public List<string> GetList() => new() { "testing" };
}
}