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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Should Python.Runtime.Py.With use Runtime.None instead of new PyObject(Runtime.PyNone)?","articleBody":"\u003e I'm not sure if I'm right, but I apologize in advance if I'm misleading the community\r\n\r\nAfter long exectution (I train large ML model), I fall into ``Fatal Python error: deallocating None``\r\n\r\n```\r\nFatal Python error: deallocating None\r\n\r\nCurrent thread 0x00007fc518efd700 (most recent call first):\r\n\r\nThread 0x00007fc4997fe700 (most recent call first):\r\n  File \"/usr/local/lib/python3.7/threading.py\", line 300 in wait\r\n  File \"/usr/local/lib/python3.7/queue.py\", line 179 in get\r\n  File \"/usr/local/lib/python3.7/site-packages/tensorboard/summary/writer/event_file_writer.py\", line 232 in run\r\n  File \"/usr/local/lib/python3.7/threading.py\", line 926 in _bootstrap_inner\r\n  File \"/usr/local/lib/python3.7/threading.py\", line 890 in _bootstrap\r\n```\r\n\r\n\r\n\r\n\u003e Sadly, I can't provide full repro, because problem does not occur in small data set, and I work on private project.\r\n\r\nIn my code I use [Should Python.Runtime.Py.With](https://github.com/pythonnet/pythonnet/blob/ec424bb0a8f0217c496898395880cf9b99d073e6/src/runtime/pythonengine.cs#L768) method.\r\n\r\nIn this method I see PyNone to be used without increment of references count\r\n\r\n```\r\nIntPtr type = Runtime.PyNone;\r\n...\r\nnew PyObject(type)\r\n```\r\n\r\nAs I undestand from [stackoverflow](https://stackoverflow.com/questions/26742837/creating-a-c-sharp-nullable-int32-within-python-using-python-net-to-call-a-c-s) each usage of None should increment Ref counter.\r\n\r\nThere is [Python.Runtime.Runtime.None](https://github.com/pythonnet/pythonnet/blob/7a9dcfa162f038fc599988ca59eb49a84be0affc/src/runtime/runtime.cs#L458) property\r\n\r\nShould Runtime.None be used instead of Runtime.PyNone\r\n\r\n### Environment\r\n\r\n-   Pythonnet version: pythonnet_netstandard (I know, it is a fork of this project, but the code under dicussion is under this project) \"Python.Runtime.Mono\" Version=\"3.7.1\"\r\n-   Python version: 3.7.7\r\n-   Operating System: Ubuntu 18.04.3 (in docker)\r\n","author":{"url":"https://github.com/IvanAntipov","@type":"Person","name":"IvanAntipov"},"datePublished":"2020-07-30T13:18:44.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/1192/pythonnet/issues/1192"}