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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Resolution fails for an overloaded CLR method when providing mixed float \u0026 int arguments via Python","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 2.4.0\r\n-   Python version: 3.7.6\r\n-   Operating System: Windows 10\r\n\r\n### Details\r\n\r\nGiven a CLR method `Foo` with overloads `Foo(int a, int b)` and `Foo(float a, float b)`, calling `Foo` from Python with one `int` and one `float` argument results in a `TypeError: no method matches given arguments for Foo`. \r\n\r\nIf the method is not overloaded and only exists in the `Foo(float a, float b)` form, then calling from Python with one `int` and one `float` works fine, as does two `ints`, since the `int` arguments can be freely converted to `float`. The existence of the overload prevents this somehow.\r\n\r\nI looked through the existing method resolution issues and didn't see this case.\r\n\r\n### Full example\r\n\r\n_MyModule\\MyClass.cs_\r\n```cs\r\nusing System;\r\n\r\nnamespace MyModule\r\n{\r\n    public class MyClass\r\n    {\r\n        public static float Add(float a, float b)\r\n        {\r\n            return a + b;\r\n        }\r\n        \r\n        public static int Add(int a, int b)\r\n        {\r\n            return a + b;\r\n        }\r\n    }\r\n}\r\n```\r\n_PythonNetFloatTest\\Program.cs_\r\n```cs\r\nusing Python.Runtime;\r\n\r\nnamespace PythonNetFloatTest\r\n{\r\n    class Program\r\n    {\r\n        static void Main(string[] args)\r\n        {\r\n            string preamble =\r\n                \"import clr\\n\" +\r\n                \"clr.AddReference('MyModule')\\n\" +\r\n                \"from MyModule import MyClass\\n\" +\r\n                \"import sys\\n\" +\r\n                \"print(sys.version)\";\r\n\r\n            string callWithFloatArgs = \"result = MyClass.Add(1.0, 2.0)\";\r\n            string callWithIntArgs   = \"result = MyClass.Add(1, 2)\";\r\n            string callWithMixedArgs = \"result = MyClass.Add(1.0, 2)\";\r\n\r\n            PythonEngine.Initialize();\r\n            using (Py.GIL())\r\n            {\r\n                using (PyScope scope = Py.CreateScope())\r\n                {\r\n                    scope.Exec(preamble);\r\n                    \r\n                    scope.Exec(callWithFloatArgs);\r\n                    System.Console.WriteLine(scope.Get(\"result\")); // prints \"3.0\"\r\n\r\n                    scope.Exec(callWithIntArgs);\r\n                    System.Console.WriteLine(scope.Get(\"result\")); // prints \"3\"\r\n\r\n                    scope.Exec(callWithMixedArgs); // throws Python.Runtime.PythonException: \r\n                                                   // 'TypeError : No method matches given arguments for Add'\r\n                    System.Console.WriteLine(scope.Get(\"result\"));\r\n                }\r\n            }\r\n        }\r\n    }\r\n}\r\n```\r\nOutput:\r\n```\r\n3.7.6 (tags/v3.7.6:43364a7ae0, Dec 19 2019, 00:42:30) [MSC v.1916 64 bit (AMD64)]\r\n3.0\r\n3\r\n\r\nUnhandled Exception: Python.Runtime.PythonException: TypeError : No method matches given arguments for Add\r\n   at Python.Runtime.Runtime.CheckExceptionOccurred()\r\n   at Python.Runtime.PyScope.Exec(String code, IntPtr _globals, IntPtr _locals)\r\n   at PythonNetFloatTest.Program.Main(String[] args) in .\\PythonNetFloatTest\\PythonNetFloatTest\\Program.cs:line 33\r\n```\r\n\r\nIf you remove the `public static int Add(int a, int b)` overload from `MyModule`, the output is instead:\r\n\r\n```\r\n3.7.6 (tags/v3.7.6:43364a7ae0, Dec 19 2019, 00:42:30) [MSC v.1916 64 bit (AMD64)]\r\n3.0\r\n3.0\r\n3.0\r\n```\r\n\r\n","author":{"url":"https://github.com/Dewb","@type":"Person","name":"Dewb"},"datePublished":"2020-02-05T02:51:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/1040/pythonnet/issues/1040"}