Reloading/shutdown support of embedding CPython with pythonnet was added in the master branch. See this pull request:
https://github.com/pythonnet/pythonnet/pull/752 On Thu, Oct 4, 2018 at 9:50 PM Denis Akhiyarov <denis.akhiya...@gmail.com> wrote: > 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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