Please search the issue tracker on github for shutdown related issues. This was discussed extensively.
There is WIP pull request worked on by 3 people to support this reloading scenario in Unity. On Wed, Oct 3, 2018, 9:50 PM Ron Harding via PythonDotNet < pythondotnet@python.org> wrote: > Did you try background or threadpool threads? Redirected process calls and > looking for stdin stdout stderr streams allows more control. > > Sent from Yahoo Mail on Android > <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> > > On Wed, Oct 3, 2018 at 15:47, Luke, Steve > <steve.l...@moldev.com> wrote: > > I am getting a crash trying to embed Python into my VB program using > Python for .NET. The goal of my application is to allow users to run > their own python scripts inside a larger application. The crash I am > getting happens the second time I run a script that imports certain large > libraries (like numpy or scikit-image) but does not affect all libraries > (for example PIL). > > > > My environment: > > Windows 10 Pro x64, Python 3.6.5 (in Anaconda), Python for .Net 2.4.0 > (installed from git’s master branch). > > > > Here is the VB code: > > Public Function Startup(ByRef param As String) As Integer > > PythonEngine.Initialize() > > 'mm.PrintMsg(PythonEngine.BuildInfo) > > 'mm.PrintMsg(PythonEngine.Compiler) > > 'mm.PrintMsg(PythonEngine.Platform) > > 'mm.PrintMsg(PythonEngine.ProgramName) > > 'mm.PrintMsg(PythonEngine.PythonHome) > > 'mm.PrintMsg(PythonEngine.PythonPath) > > Using (Py.GIL()) > > > > Dim scriptPath As String = param > > > > Dim scriptDir As String = Path.GetDirectoryName(scriptPath) > > Dim scriptName As String = GetPythonModuleName(scriptPath) > > Dim scriptParam As String = "" > > > > Dim scriptScope As PyScope = Py.CreateScope() > > > > Dim scriptText As String = > My.Computer.FileSystem.ReadAllText(scriptPath) > > scriptScope.Exec(scriptText) > > > > If scriptScope.Contains(STARTUP_METHOD_NAME) Then > > scriptScope.Exec(String.Format("{0}(r'{1}')", > STARTUP_METHOD_NAME, scriptParam)) > > End If > > > > scriptScope.Dispose() > > End Using > > PythonEngine.Shutdown() > > > > Return 0 > > End Function > > > > And this is the Python script I am running: > > import skimage.io > > > > def Startup(param): > > pass > > > > def Docommand(param): > > pass > > > > def Shutdown(): > > pass > > > > When I run it the VB code the first time, things work great. When I run > the VB code a second time (without first restarting the entire application) > I get an access violation exception on the scriptScope.Exec() call: > > *Exception:* System.AccessViolationException : > > *Message:* Attempted to read or write protected memory. This is often an > indication that other memory is corrupt. > > *Source:* Python.Runtime > > *StackTrace:* > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyObject_Call(IntPtr pointer, IntPtr args, > IntPtr kw) > > at Python.Runtime.ImportHook.__import__(IntPtr self, IntPtr args, > IntPtr kw) > > at Python.Runtime.Runtime.PyRun_String(String code, IntPtr st, IntPtr > globals, IntPtr locals) > > at Python.Runtime.PyScope.Exec(String code, IntPtr _globals, IntPtr > _locals) > > at MyApp.MyClass.Startup(String& param) in C:\Git\MyPath\MyApp.vb:line > 132 > > Unfortunately the stack trace doesn't show line numbers for anything in > the Python.Runtime. > > > > Interestingly, if you look at the VB code, I have some lines of commented > out code: > > 'mm.PrintMsg(PythonEngine.BuildInfo) > > 'mm.PrintMsg(PythonEngine.Compiler) > > 'mm.PrintMsg(PythonEngine.Platform) > > 'mm.PrintMsg(PythonEngine.ProgramName) > > 'mm.PrintMsg(PythonEngine.PythonHome) > > 'mm.PrintMsg(PythonEngine.PythonPath) > > > Since the app doesn’t have a console, this sends the text to the enclosing > app for display. If I uncommon that code, then the first time I run it I > get: > > default, Mar 29 2018, 13:32:41 > > [MSC v.1900 64 bit (AMD64)] > > win32 > > python > > > > F:\Anaconda3\python36.zip;F:\Anaconda3\Lib;F:\Anaconda3\DLLs;C:\MX6 > > > > And the second time I run it I get: > > default, Mar 29 2018, 13:32:41 > > [MSC v.1900 64 bit (AMD64)] > > win32 > > *pyth???* > > *???* > > F:\Anaconda3\python36.zip;F:\Anaconda3\Lib;F:\Anaconda3\DLLs;C:\MX6 > > > > And the application doesn’t crash! Instead it just says the skimage > module can’t be found. Notice the bolded lines (bold added after the > fact). The program name and python home values are being corrupted. > > Is there something I am doing wrong as far as taking down the PythonEngine > such that it could be put back up in an as-new state later on? > > > Steve > > > Please be advised that this email may contain confidential information. If > you are not the intended recipient, please notify us by email by replying > to the sender and delete this message. The sender disclaims that the > content of this email constitutes an offer to enter into, or the acceptance > of, any agreement; provided that the foregoing does not invalidate the > binding effect of any digital or other electronic reproduction of a manual > signature that is included in any attachment. > _________________________________________________ > Python.NET mailing list - PythonDotNet@python.org > https://mail.python.org/mailman/listinfo/pythondotnet > > _________________________________________________ > Python.NET mailing list - PythonDotNet@python.org > https://mail.python.org/mailman/listinfo/pythondotnet >
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