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<div class="WordSection1">
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I too am working (slowly) on adding pythonnet as scripting environment for a .NET application. When investigating this I wrote a VS project that tested all the assumptions I was making about how the interface worked. That is available
on GitHub at: https://github.com/tomunger/pythonnet.embedingtest</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Below is the method I use to load a module. Note that I don’t
<u>import</u> the module but <u>execute</u> it in the PyScope. </p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tom</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> private PyScope LoadModule(string name, string fileName, Dictionary<string, object> globals)</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> PyScope scope = null;</p>
<p class="MsoNormal"> using (Py.GIL())</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> // Create a new scope</p>
<p class="MsoNormal"> scope = Py.CreateScope(name);</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> // Assign any globals.</p>
<p class="MsoNormal"> if (globals != null)</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> foreach (string gname in globals.Keys)</p>
<p class="MsoNormal"> scope.Set(gname, globals[gname]);</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> // Load python code, compile, then execute it in the scope.</p>
<p class="MsoNormal"> string scriptText = File.ReadAllText(fileName);</p>
<p class="MsoNormal"> PyObject code = PythonEngine.Compile(scriptText, fileName);</p>
<p class="MsoNormal"> dynamic r = scope.Execute(code);</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> return scope;</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> PythonDotNet <pythondotnet-bounces+tunger=mitem.com@python.org> on behalf of Mohamed Koubaa <mohamed.koubaa@ansys.com><br>
<b>Sent:</b> Monday, September 24, 2018 7:03:52 AM<br>
<b>To:</b> pythondotnet@python.org<br>
<b>Cc:</b> hbtmdxywg@126.com<br>
<b>Subject:</b> Re: [Python.NET] Using PyScope to set variables I can use in imported scripts</font>
<div> </div>
</div>
<div>
<div dir="ltr">Steve,
<div><br>
</div>
<div>My organization is interested in migrating from IronPython to PythonNet so I'll add my two cents. We do this:</div>
<div><br>
</div>
<div>1. (during startup) Run a short python file which imports some .NET namespaces into a scope</div>
<div>2. (during startup) Add some variables to that scope (globals which give scripts access to our data model)</div>
<div>3. (at arbitrary times later) Run python code in the above scope so that there isn't a need to import the namespaces or discover the data model</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Mohamed Koubaa</div>
<div>ANSYS Inc </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Mon, Sep 24, 2018 at 8:59 AM Luke, Steve <<a href="mailto:Steve.Luke@moldev.com">Steve.Luke@moldev.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-1433265528472523567divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif" dir="ltr">
<p style="margin-top:0;margin-bottom:0">Yes, I did. All the unit tests for PyScope use the Eval(), Exec(), or Execute() functions to get code to execute in the PyScope. They don't use Import the way I had been (hoping to do).</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I am probably using it differently than intended/expected. I am importing a script into the scope and expect to be able to inject variables into the imported module. <span style="font-size:12pt">That doesn't seem to
be what PyScope is used for. Instead, PyScope seems to be a container for the code and variables like the __main__ scope that gets created when running Python from the command prompt. It looks like when you Import it creates a new nested scope which doesn't
have access to the scope created by PyScope</span><span style="font-size:12pt">. I had expected it to work as PyScope was the scope in which the Imported code would be executed, not the parent scope. I think the intended way to use PyScope and access the
variables it holds is to pass the code in as Strings using Exec().</span></p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I think the right thing to do is:</p>
<p style="margin-top:0;margin-bottom:0"></p>
<p style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols;font-size:16px">
1) Set variables in PyScope</p>
<div><span style="font-size:12pt">2) Add the path to the script to the sys.path</span><br>
</div>
<p></p>
<p style="margin-top:0;margin-bottom:0"><span style="font-size:12pt">3) Read the contents of the script file into a string</span><br>
</p>
<p style="margin-top:0;margin-bottom:0">4) Use the PyScope to Exec() Execute() or Eval() as appropriate</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">This works it is just not the same as what I was used to with IronPython (which is fine if that is really how it is intended to be used).</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">Steve</p>
</div>
<hr style="display:inline-block;width:98%">
<div id="m_-1433265528472523567divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Denis Akhiyarov <<a href="mailto:denis.akhiyarov@gmail.com" target="_blank">denis.akhiyarov@gmail.com</a>><br>
<b>Sent:</b> Monday, September 24, 2018 9:36:19 AM<br>
<b>To:</b> Luke, Steve; A list for users and developers of Python for .NET<br>
<b>Cc:</b> ywg<br>
<b>Subject:</b> Re: [Python.NET] Using PyScope to set variables I can use in imported scripts</font>
<div> </div>
</div>
<div>
<div dir="ltr">
<div dir="ltr">I copied Wenguang Yang (@yagweb), who developed PyScope.</div>
<div dir="ltr"><br>
</div>
<div>Steve, did you look at the unit tests for PyScope?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Denis</div>
</div>
<br>
<div class="m_-1433265528472523567x_gmail_quote">
<div dir="ltr">On Mon, Sep 24, 2018 at 8:28 AM Luke, Steve <<a href="mailto:Steve.Luke@moldev.com" target="_blank">Steve.Luke@moldev.com</a>> wrote:<br>
</div>
<blockquote class="m_-1433265528472523567x_gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-1433265528472523567x_m_4818856398437586376divtagdefaultwrapper" dir="ltr" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols">
<p style="margin-top:0;margin-bottom:0">I am new to Python.Net and trying to convert an application that used IronPython to embed a Python environment into a .Net application and allow the user to run Python scripts inside our application. The part that embeds
the Python environment is VB.Net (but could be C# if that would be better).</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I am running into problems setting variables in the scope such that they can be used in the Python scripts we call. I keep getting an error: NameError: global name 'Bridge' is not defined.</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">This is the VB code I am trying to use:</p>
<p style="margin-top:0;margin-bottom:0"></p>
<div><span style="font-size:12pt"><span style="font-family:"Courier New",monospace;font-size:16px"> </span><span style="font-family:"Courier New",monospace">PythonEngine.Initialize()</span></span><br>
</div>
<div><br>
</div>
<div><span style="font-family:"Courier New",monospace"> Using (Py.GIL())</span></div>
<div><span style="font-family:"Courier New",monospace"> Dim moduleName As String = "PrintToBridge"</span></div>
<div><span style="font-family:"Courier New",monospace"> Dim pythonCommandLine As String = "Not used yet"</span></div>
<div><br>
</div>
<div><span style="font-family:"Courier New",monospace"> Dim scope As PyScope = Py.CreateScope()</span></div>
<div><span style="font-family:"Courier New",monospace"> Try</span></div>
<div><span style="font-family:"Courier New",monospace"> <span>scope.Set("Bridge", bridge)</span></span></div>
<div><span style="font-family:"Courier New",monospace"> scope.Set("SetupParams", cmdLine</span><span style="font-family:"Courier New",monospace">)</span></div>
<div><br>
</div>
<div><span style="font-size:12pt;font-family:"Courier New",monospace"> Dim script As Object = scope.Import(moduleName)</span><br>
</div>
<div><span style="font-family:"Courier New",monospace"> bridge.mm.PrintMsg("Scope has Bridge:" + Str(scope.Contains("Bridge")))</span></div>
<div><span style="font-size:12pt;font-family:"Courier New",monospace"> script.Startup(pythonCommandLine)</span><br>
</div>
<div><span style="font-family:"Courier New",monospace"> Finally</span></div>
<div><span style="font-family:"Courier New",monospace"> scope.Dispose()</span></div>
<div><span style="font-family:"Courier New",monospace"> End Try</span></div>
<div><span style="font-family:"Courier New",monospace"> End Using</span></div>
<div><br>
</div>
The Python script:
<p></p>
<p style="margin-top:0;margin-bottom:0"></p>
<div><span style="font-family:"Courier New",monospace">def Startup(param):</span></div>
<div><span style="font-family:"Courier New",monospace"> Bridge.mm.PrintMsg('Startup called')</span></div>
<div><br>
</div>
<div><span style="font-family:"Courier New",monospace">def Docommand(param):</span></div>
<div><span style="font-family:"Courier New",monospace"> Bridge.mm.PrintMsg('docommand called')</span></div>
<div><span style="font-family:"Courier New",monospace"> </span></div>
<div><span style="font-family:"Courier New",monospace">def Shutdown():</span></div>
<div><span style="font-family:"Courier New",monospace"> Bridge.mm.PrintMsg('Shutdown called')</span></div>
<div><br>
</div>
<br>
<p></p>
<p style="margin-top:0;margin-bottom:0">How can I set a variable such that it would be recognized by the called Python script? Importing the script works, I can force python-y things to happen. And the check to see if the object I want is in scope returns
true. But it still isn't available in Python.</p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">I have tried <span><span style="font-family:"Courier New",monospace">scope.Eval(moduleName + ".Startup('" + pythonCommandLine + "')")</span> and Exec() with locals:</span></p>
<p style="margin-top:0;margin-bottom:0"><span></span></p>
<div><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols;font-size:16px"> </span>Dim locals As PyDict = New PyDict()</div>
<div> locals.SetItem("Bridge".ToPython(), bridge.ToPython())</div>
<div> scope.Exec(moduleName + ".Startup('" + pythonCommandLine + "')", locals)</div>
<br>
<p></p>
<p style="margin-top:0;margin-bottom:0"><span>All with the same effect. Any ideas on how to get set variables so scripts can gain access to them?</span></p>
<p style="margin-top:0;margin-bottom:0"><br>
</p>
<p style="margin-top:0;margin-bottom:0">Thanks,</p>
<div id="m_-1433265528472523567x_m_4818856398437586376Signature">
<div id="m_-1433265528472523567x_m_4818856398437586376divtagdefaultwrapper" dir="ltr" style="font-size:12pt;color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols">
<p style="margin-top:0;margin-bottom:0"></p>
<p class="m_-1433265528472523567x_m_4818856398437586376x_MsoNormal" style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(33,33,33)">
<span style="font-size:10pt;font-family:Arial,sans-serif,serif,EmojiFont">Steve</span></p>
<p class="m_-1433265528472523567x_m_4818856398437586376x_MsoNormal" style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(33,33,33)">
<br>
</p>
<p></p>
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