Getting an error when calling `load` more than once

[bendhayer]

Environment

• Pythonnet version: 3.0.1
• Python version: 3.11.1
• Operating System: Windows & Linux
• .NET Runtime: net6.0, net7.0

Details

• Describe what you were trying to get done.

I have 2 libraries that are packaging some C# code with pythonnet as a dependency so that they can be used from Python without issues. In both libraries I call load("coreclr") in the __init__.py. When a user try to load both libraries at the same time pythonnet throw an exception. It wasn't happening with pythonnet version 2 so I suspect that this is a bug of pythonnet version 3.

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

from pythonnet import load

load("coreclr")
load("coreclr")

• If there was a crash, please include the traceback here.

Failed to initialize pythonnet: System.InvalidOperationException: This property must be set before runtime is initialized
 at Python.Runtime.Runtime.set_PythonDLL(String value) in /tmp/build-via-sdist-dq4gmg3h/pythonnet-3.0.1/src/runtime/Runtime.cs:line 27
 at Python.Runtime.Loader.Initialize(IntPtr data, Int32 size) in /tmp/build-via-sdist-dq4gmg3h/pythonnet-3.0.1/src/runtime/Loader.cs:line 23
 at Python.Runtime.Runtime.set_PythonDLL(String value) in /tmp/build-via-sdist-dq4gmg3h/pythonnet-3.0.1/src/runtime/Runtime.cs:line 27
 at Python.Runtime.Loader.Initialize(IntPtr data, Int32 size) in /tmp/build-via-sdist-dq4gmg3h/pythonnet-3.0.1/src/runtime/Loader.cs:line 23Traceback (most recent call last):
 File "/home/gitlab-runner/test_pythonnet/test.py", line 4, in <module>
 load("coreclr")
 File "/home/gitlab-runner/test_pythonnet/.venv/lib/python3.11/site-packages/pythonnet/__init__.py", line 144, in load
 raise RuntimeError("Failed to initialize Python.Runtime.dll")
RuntimeError: Failed to initialize Python.Runtime.dll

[filmor]

This is indeed an oversight, I apparently dropped a _LOADED = True while moving code around in pythonnet.load which "allows" it to reinitialize things twice.