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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"C# jagged arrays and lists make Unity crash the second time","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 3.0.0-preview2022-03-03\r\n-   Python version: 3.8.9\r\n-   Operating System: Windows 10\r\n-   .NET Runtime: 4\r\n-   Unity 2020.3.12f1\r\n\r\n### Details\r\n\r\n-   Describe what you were trying to get done.\r\n\r\n Trying to send a jagged array or List of float 1D array to Python via C# in Unity. This works the first time I press play in Unity but crashes on the second time without any errors.\r\n\r\n-   See below for a C# script that creates a normal 2D array, a jagged array and a listarray. If I send the normal array, it works fine restarting. However the jagged array and list do make unity crash if I press play for a second time.\r\n\r\n```C#\r\nusing System.Collections.Generic;\r\nusing UnityEngine;\r\nusing System.IO;\r\nusing Python.Runtime;\r\n\r\npublic class MinimalExample : MonoBehaviour\r\n{\r\n    float[,] twoDimArray = null;\r\n    float[][] jaggedArray = null;\r\n    List\u003cfloat[]\u003e listArray = new List\u003cfloat[]\u003e();\r\n\r\n    void Start()\r\n    {\r\n        //Adjust the line below to your target python version in the correct folder\r\n        Runtime.PythonDLL = Application.dataPath + \"/StreamingAssets/embeddedPy/python38.dll\";\r\n\r\n        for (int i = 0; i\u003c2; i++)\r\n        {\r\n            float[] temp = { 1.2345679f, 9.87654321f, 1.23456789f};\r\n            listArray.Add(temp);\r\n        }\r\n\r\n        twoDimArray = new float[,] { { 1.2345679f, 9.87654321f, 1.23456789f }, { 1.2345679f, 9.87654321f, 1.23456789f } };\r\n\r\n        jaggedArray = listArray.ToArray();\r\n        SendToPython(twoDimArray, jaggedArray, listArray);\r\n    }\r\n\r\n    void SendToPython(float[,] ex2, float[][] ex3, List\u003cfloat[]\u003e ex4)\r\n    {\r\n\r\n        using (Py.GIL())\r\n        {\r\n            dynamic py_sys = Py.Import(\"sys\");\r\n            string site_pkg = \"Lib\\\\site-packages\";\r\n            py_sys.path.insert(0, Path.Combine(Application.streamingAssetsPath, site_pkg));\r\n            dynamic pythonScript = Py.Import(\"MinimalExample\");\r\n\r\n            //If we use ex2 here as input, restarting inside unity works. Restarting does not work for ex3 and ex4\r\n            dynamic returnedValue = pythonScript.ReturnValue(ex2); \r\n\r\n            Debug.Log(returnedValue);\r\n        }\r\n    }\r\n}\r\n```\r\n\r\n```python\r\nimport numpy as np\r\n\r\ndef ReturnValue(data):\r\n    result = np.asarray(data)\r\n    return result\r\n```\r\n\r\n-   A simple solution is to transform my jagged arrays and lists to normal arrays. However I was wondering if I am doing something wrong or this is indeed an unknown bug. \r\n\r\n\r\n","author":{"url":"https://github.com/Zulex","@type":"Person","name":"Zulex"},"datePublished":"2022-03-04T18:41:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/1713/pythonnet/issues/1713"}