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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug?] When `Runtime` initialization is interrupted by an exception, the `_isInitialized` flag is not cleared","articleBody":"When calling `PythonEngine.Initialize`, an exception is occasionally encountered:\n\n```c\nArgumentException: An item with the same key has already been added. Key: missing type: GUITable`1+Col[T], Assembly-CSharp-Editor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null\nSystem.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Collections.Generic.Dictionary`2[TKey,TValue].OnDeserialization (System.Object sender) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Runtime.Serialization.ObjectManager.RaiseDeserializationEvent () (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize (System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Runtime.Serialization.Formatters.Binary.__BinaryParser serParser, System.Boolean fCheck, System.Boolean isCrossAppDomain, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck, System.Boolean isCrossAppDomain, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck, System.Runtime.Remoting.Messaging.IMethodCallMessage methodCallMessage) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler, System.Boolean fCheck) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nSystem.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream) (at \u003ceae584ce26bc40229c1b1aa476bfa589\u003e:0)\nPython.Runtime.RuntimeData.RestoreRuntimeDataImpl () (at \u003c4d967fa352254671bac5c8512970d45e\u003e:0)\nPython.Runtime.RuntimeData.RestoreRuntimeData () (at \u003c4d967fa352254671bac5c8512970d45e\u003e:0)\nPython.Runtime.Runtime.Initialize (System.Boolean initSigs) (at \u003c4d967fa352254671bac5c8512970d45e\u003e:0)\nPython.Runtime.PythonEngine.Initialize (System.Collections.Generic.IEnumerable`1[T] args, System.Boolean setSysArgv, System.Boolean initSigs) (at \u003c4d967fa352254671bac5c8512970d45e\u003e:0)\nPython.Runtime.PythonEngine.Initialize (System.Boolean setSysArgv, System.Boolean initSigs) (at \u003c4d967fa352254671bac5c8512970d45e\u003e:0)\nPython.Runtime.PythonEngine.Initialize () (at \u003c4d967fa352254671bac5c8512970d45e\u003e:0)\nUnityEditor.Scripting.Python.PythonRunner.DoEnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:677)\nUnityEditor.Scripting.Python.PythonRunner.EnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:312)\nUnityEditor.Scripting.Python.PythonRunner.RunFile (System.String pythonFileToExecute, System.String scopeName) (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:175)\nUnityEditor.Scripting.Python.PythonScriptsWindow.ExecutePythonScript () (at Packages/com.unity.scripting.python/Editor/PythonScriptsWindow.cs:129)\nUnityEngine.UIElements.Clickable.Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:81)\nUnityEngine.UIElements.Clickable.OnMouseUp (UnityEngine.UIElements.MouseUpEvent evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:158)\nUnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallback.cs:64)\nUnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallbackRegistry.cs:332)\nUnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:95)\nUnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:77)\nUnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/Events/MouseCaptureDispatchingStrategy.cs:92)\nUnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:310)\nUnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:275)\nUnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:238)\nUnityEngine.UIElements.EventDispatcher.OpenGate () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:203)\nUnityEngine.UIElements.EventDispatcherGate.Dispose () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:44)\nUnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:301)\nUnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:159)\nUnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/Panel.cs:257)\nUnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:404)\nUnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:194)\nUnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Int32\u0026 ret) (at d:/unityengine/Modules/IMGUI/GUIUtility.cs:198)\n```\n\nBut `Runtime._isInitialized` has already been set to `true` and wasn’t cleared:\n\nhttps://github.com/pythonnet/pythonnet/blob/a21c7972809500edd6364003c37695193ac1a5d4/src/runtime/Runtime.cs#L113\n\nAfter the above exception occurs, if you try to re-initialize the Python Engine, another exception will be encountered:\n\n```c\nInvalidOperationException: This property must be set before runtime is initialized\nPython.Runtime.Runtime.set_PythonDLL (System.String value) (at \u003c4d967fa352254671bac5c8512970d45e\u003e:0)\nUnityEditor.Scripting.Python.PythonRunner.InstallAndLoadPython () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:419)\nUnityEditor.Scripting.Python.PythonRunner.DoEnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:674)\nUnityEditor.Scripting.Python.PythonRunner.EnsureInitialized () (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:312)\nUnityEditor.Scripting.Python.PythonRunner.RunFile (System.String pythonFileToExecute, System.String scopeName) (at Packages/com.unity.scripting.python/Editor/PythonRunner.cs:175)\nUnityEditor.Scripting.Python.PythonScriptsWindow.ExecutePythonScript () (at Packages/com.unity.scripting.python/Editor/PythonScriptsWindow.cs:129)\nUnityEngine.UIElements.Clickable.Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:81)\nUnityEngine.UIElements.Clickable.OnMouseUp (UnityEngine.UIElements.MouseUpEvent evt) (at d:/unityengine/Modules/UIElements/Clickable.cs:158)\nUnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallback.cs:64)\nUnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventCallbackRegistry.cs:332)\nUnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:95)\nUnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at d:/unityengine/Modules/UIElements/Events/EventHandler.cs:77)\nUnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/Events/MouseCaptureDispatchingStrategy.cs:92)\nUnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:310)\nUnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:275)\nUnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:238)\nUnityEngine.UIElements.EventDispatcher.OpenGate () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:203)\nUnityEngine.UIElements.EventDispatcherGate.Dispose () (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:44)\nUnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:301)\nUnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/EventDispatcher.cs:159)\nUnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at d:/unityengine/Modules/UIElements/Panel.cs:257)\nUnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:404)\nUnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at d:/unityengine/Modules/UIElements/UIElementsUtility.bindings.cs:194)\nUnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Int32\u0026 ret) (at d:/unityengine/Modules/IMGUI/GUIUtility.cs:198)\n```\n\nAt this point, it is impossible to clean up the Python environment through `PythonEngine.Shutdown`, and the entire .NET environment can only be restarted.\n","author":{"url":"https://github.com/SolarianZ","@type":"Person","name":"SolarianZ"},"datePublished":"2025-09-23T07:26:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/2620/pythonnet/issues/2620"}