Description

gusmanb

opened on Oct 22, 2024

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Environment

• Pythonnet version: 3.0.4
• Python version: 3.13 and 3.14 alpha
• Operating System: Windows 11 64 bits
• .NET Runtime: .net 8.0

Details

Trying to initialize pythonnet with Python 3.13 or higher crashes with MissingMethodException: Failed to load symbol _PyThreadState_UncheckedGet

void Initialize()
{
    Runtime.PythonDLL = "path_to_dll";
    PythonEngine.Initialize(); //crash
}

• StackTrace:

 en Python.Runtime.Runtime.Delegates.get_Py_IsInitialized()
   en Python.Runtime.Runtime.Py_IsInitialized()
   en Python.Runtime.Runtime.<>c.<Initialize>b__32_0()
   en Python.Runtime.Runtime.TryUsingDll[T](Func`1 op)
   en Python.Runtime.Runtime.Initialize(Boolean initSigs)
   en Python.Runtime.PythonEngine.Initialize(IEnumerable`1 args, Boolean setSysArgv, Boolean initSigs)
   en Python.Runtime.PythonEngine.Initialize(Boolean setSysArgv, Boolean initSigs)
   en Python.Runtime.PythonEngine.Initialize()

Activity

1. filmor commented on Oct 23, 2024

   

   filmor

   on Oct 23, 2024

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   Neither of those are supported, as documented.

   Reacted by Charles Zhang
2. filmor

   closed this as completedon Oct 23, 2024
3. gusmanb commented on Oct 23, 2024

   

   gusmanb

   on Oct 23, 2024

   Author

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   Neither of those are supported, as documented.

   Sorry but, where is it documented? I can't find it in the wiki.

   Also, are there any plans to support them?

   Reacted by Charles Zhang
4. chaojian-zhang commented on Oct 30, 2024

   

   chaojian-zhang

   on Oct 30, 2024

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   I found it - Per https://pythonnet.github.io/: "Python.NET is currently compatible and tested with Python releases 3.7 - 3.11"

   Reacted by Agustín Gimenez Bernad and Charles Zhang
5. filmor

   reopened this on Oct 30, 2024
6. filmor

   closed this as completedon Oct 30, 2024
7. filmor commented on Oct 30, 2024

   

   filmor

   on Oct 30, 2024

   Member

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   Actually, 3.12 is supported, I have adjusted the homepage. The PR for 3.13 is #2454 but it's crashing on init right now.

   Reacted by Agustín Gimenez Bernad
8. gusmanb commented on Oct 30, 2024

   

   gusmanb

   on Oct 30, 2024

   Author

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   Actually, 3.12 is supported, I have adjusted the homepage. The PR for 3.13 is #2454 but it's crashing on init right now.

   Thanks for the info.
9. jpactor commented on Nov 15, 2025

   

   jpactor

   on Nov 15, 2025

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   Now over one year later: is 3.14 supported yet?
10. SciDaa commented on Dec 1, 2025

    

    SciDaa

    on Dec 1, 2025

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    Now over one year later: is 3.14 supported yet?

    Not yet. According to the meta info https://pypi.org/project/pythonnet/. Currently requires: Python <3.14, >=3.7.
    I try on 3.14, it either fail at import step or addReference step in different Win11 machines.
    3.13 works fine.

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