Bug Unity crash with PyModule.Exec after assembly reload

Unity will crash if you do the following things with python scripting package

In c# code, send a c# list to python

Code (CSharp):

1.         using (Py.GIL())
2.         using (PyModule scope = Py.CreateScope())
3.         {
4.             List<float> foo = new List<float>();
5.             foo.Add(1);
6.             scope.Set("_foo", foo.ToPython());
7.             scope.Exec(string.Format("exec(open('{0}').read())", pythonFileToExecute));
8.         }

In python code, convert the c# list to numpy array

Code (CSharp):

1. import numpy as np
2.  
3. foo = np.array(_foo).astype(np.float32)

It works well. But if you then edit any c# scripts and assembly reloaded, afterward running those python codes again will crash unity.

I create a sample unity project to reproduce the bug and attached it to this thread. Here are steps to reproduce the bug:
1. Open a window from menu Test->Python Scripts, click button "Run Python Script"
2. Edit any c# file so that unity will reload assemblies
3. Click button "Run Python Script" again, unity will crash