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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cannot run twice; Unity crashes after running more than once","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 2.3.0 py35\r\n-   Python version: 3.5.4\r\n-   Operating System: Windows 10\r\n\r\n### Details\r\n\r\nI want to run this code on my Unity project:\r\n```cs\r\nusing Python.Runtime;\r\nusing UnityEngine;\r\n\r\npublic class TestLib : MonoBehaviour\r\n{\r\n    // Use this for initialization\r\n    private void Start()\r\n    {\r\n        print(\"initializing python\");\r\n        PythonEngine.Initialize();\r\n        print(\"running python code\");\r\n        using (Py.GIL())\r\n        {\r\n            dynamic np = Py.Import(\"numpy\");\r\n            print(np.cos(np.pi * 2));\r\n        }\r\n\r\n        print(\"Destroying python engine\");\r\n        PythonEngine.Shutdown();\r\n    }\r\n}\r\n```\r\nHere's the output:\r\n![2018-07-06_05-02-13](https://user-images.githubusercontent.com/15215732/42350302-1659992a-80da-11e8-929f-19352fa80e9f.png)\r\n\r\n\r\nIt's able to run once but when I try to run it again, Unity editor crashes.\r\n\r\nHere's the entire process:\r\nI open Unity. Inside it, I click *play* to run this code, it works. And then I stop, and then I run the code again, Unity crashes.\r\n\r\n#### Reasoning\r\n- I'm suspecting that it's because python is still running in the background when I stop the game session.\r\nBut I tried Initialize() and Shutdown() twice in the code and it works (if I run it once). So I think it's not shutting down issue. It's something else that I cannot figure out.\r\n- This error depends on the python code for sure. If I remove the python part and run, it would be able to run as many times as I want.\r\n- It might also be a threading issue which I don't understand.\r\n\r\n\r\nWhat are the possible causes and fixes?\r\n","author":{"url":"https://github.com/offchan42","@type":"Person","name":"offchan42"},"datePublished":"2018-07-05T22:01:27.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/701/pythonnet/issues/701"}