Mailman 3 March 2004 - Python.NET

Python.NET and COM CoClasses
by Bruce Dodson April 29, 2004

April 29, 2004

I tried to use Python.NET with COM objects, and I couldn't get it to work. The documentation says it works, so I assume either that there is a bug or that I'm doing something wrong. Background: I have a large COM library of vtbl-based interfaces, not accessible through Win32all. They can be accessed through ctypes but it's slow and there are a many cases where the autogenerated wrappers are wrong. This library ships with .NET assemblies which properly deal with those special cases, so that's why I'm interested in Python.NET. What happens is I can import the interfaces, and I can import the CoClasses, but Python.NET seems to think the CoClasses are interfaces too. So when I try to instantiate an object, it fails with a message "interface constructor requires a single argument" or something like that. Any ideas? Bruce

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MSScriptControl Objects
by Andrew Powell March 29, 2004

March 29, 2004

Hello all. Newcommer to the newsgroups so please let me know if Im not adhering to any policy. Ive setup an app (.NET app) which is using the MSScriptControl. I have the ActivePython package installed and the ActiveScript engine for Python registered. Thats all peachykeen. Im running into a problem whereby Objects that Ive extended to the script arent being 'seen' correctly by the engine. Other languages such as VBScript, JScript and RubyScript are dealing with and using the objects just fine. The following is an error that the pyscript engine returned upon using an object ive named 'Graphics'. The following error occurs when I try to use the methods, properties or subclasses of any object extended to the script via MSScriptControl.AddObject. Error Number : -2147352567 Description : Traceback (most recent call last): File "<Script Block >", line 22, in Widget_Activate Widget_Paint() File "<Script Block >", line 36, in Widget_Paint Graphics.Clear File "C:\Python23\Lib\site-packages\win32comext\axscript\client\pyscript.py", line 146, in __getattr__ return self._scriptItem_.subItems[string.lower(attr)].attributeObject AttributeError: 'NoneType' object has no attribute 'subItems' Line 145 Column -1 I would greatly appreciate any feedback on this, and how to get objects extended to the scripts working in python. Thanks!

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scary fun (who needs SystemExit?)
by Aaron Watters March 25, 2004

March 25, 2004

Just fiddling around here: C:\misc\PythonNet-1.0-beta3>python Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import CLR >>> L = CLR.System.Diagnostics.Process.GetProcesses() >>> for x in L: ... if x.ProcessName == u"python": ... x.Kill() C:\misc\PythonNet-1.0-beta3> This is one of very many scary things that can be done very easily using Python.Net. (I haven't tried to see what happens if it attempts to kill all the other processes before committing suicide...) Too much rope? Anyways, this is certainly a great way to fiddle around with the Libraries. thanks again. -- Aaron Watters

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How to use "out" or "ref" on method parameter list
by Jill-Connie Lorentsen March 25, 2004

March 25, 2004

I have a DotNet class with methods with the following signature: public bool MyMethod(out int myVariable) { myVariable = 5; return true } Does anybody know how I cancall them from Python via CLR? I've tried MyMethod(a), where a has been an empty list, a list with one element, an integer etc, but nomatter what i get an error saying TypeError: no method matches given arguments Can anybody help? Jill

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Using a .Net DLL
by Sean McKay March 12, 2004

March 12, 2004

Hi, I'm trying to come up with a port of a python project into C# (to speed it up, and get experience with C#), and I'm having problems using the C# DLL I've created. I've added it to the GAC... Here is the Python code, and also the C# code.. Any help is appreciated! Thanks, Sean >>> import CLR >>> import CLR.nltk >>> from CLR.nltk import Set >>> dir(Set) ['__doc__', '__name__'] >>> from CLR.nltk.Set import Set >>> dir(Set) ['Equals', 'Finalize', 'GetHashCode', 'GetType', 'MemberwiseClone', 'ReferenceEquals', 'ToString', '__and__', '__call__', '__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__', '__doc__', '__eq__', '__getattribute__', '__getitem__', '__hash__', '__init__', '__iter__', '__len__', '__module__', '__new__', '__or__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__str__', '__sub__', 'contains', 'copy', 'count', 'dict', 'difference', 'elements', 'f_measure', 'intersection', 'precision', 'recall', 'union'] >>> a = Set([5,3,2,1]) Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: 'MethodObject' object is not callable C# code: namespace nltk { namespace Set { public class Set { protected Dict dict ; public Set(Dict idict) { dict = idict; } public Set(params object[] list) { __init__(list); } private void __init__(params object[] list) { dict = new Dict(); foreach (object name in list) dict[name.ToString()] = 1; } public string[] elements() { return dict.GetKeys; } public Set union(Set other) { Dict newDict = new Dict(); foreach (string key in dict.Keys) newDict[key] = 1; foreach (string key in other.elements()) newDict[key] = 1; return new Set(newDict); } public bool contains(object element) { return dict.Contains(element.ToString()); } public bool contains(string element) { return dict.Contains(element); } public Set intersection(Set other) { Dict newDict = new Dict(); foreach (string key in dict.Keys) if (other.contains(key)) newDict[key] = 1; return new Set( newDict); } public Set difference(Set other) { Dict newDict = new Dict(); foreach (string key in dict.Keys) if (!other.contains(key)) newDict[key] = 1; return new Set(newDict); } public Set __and__(Set other) { return intersection(other); } public Set __or__(Set other) { return union(other); } public Set __sub__(Set other) { return difference(other); } public bool __contains__(string element) { return dict.Contains(element); } public Set copy() { Dict newDict = new Dict(); foreach (string key in dict.Keys) newDict[key] = 1; return new Set(newDict); } public float precision(Set other) { int guessed = other.elements().Length; if (guessed==0) return 0; int found = intersection(other).elements().Length; return (float) found / guessed; } public float recall(Set other) { int toFind = elements().Length; if (toFind == 0) return 0; int found = intersection(other).elements().Length; return (float) found / toFind; } public float f_measure(Set other, float alpha) { float p = precision(other); float r = recall(other); if (p==0 || r==0) return 0; return 1/(alpha/p + (1-alpha)/r); } public float f_measure(Set other) { return f_measure(other, (float)0.5); } public string __repr__() { return string.Format("[{0}]",string.Join(", ",elements())).Replace("[","{").Replace("]","}"); } public int __len__() { return dict.GetKeys.Length; } public int count() { return __len__(); } public int __cmp__(Set other) { if (other.count() > count()) return -1; else if (other.count() == count()) return 0; else return 1; } public bool __eq__(Set other) { return (other == this); } public virtual int __hash__() { return dict.GetHashCode(); } } __________________________________ Do you Yahoo!? Yahoo! Search - Find what you�re looking for faster http://search.yahoo.com

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RE: [Python.NET] Using a .Net DLL
by Sean McKay March 12, 2004

March 12, 2004

Thane, I figured out the problem.. it turns out that I had an old version of the DLL in the GAC (and at one point an old one copied to the Python.Net directory).. when I updated the GAC (and deleted the one in the Python.Net directory) I was able to successfully initialize the Set object. Thanks for looking into this. I wouldn't have figured it out if you hadn't shown it working on your box! Sean --- Thane <thane(a)magna-capital.com> wrote: > Code is good. See output below. I suspect that Python.NET can't see > something... > > I'll keep playing with it and try to duplicate your error. > > --Thane > > ----------- PYTHON OUTPUT ----------------- > Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on > win32 > Type "copyright", "credits" or "license" for more information. > >>> Running initialization script, please stand by... > >>> import CLR.nltk > >>> from CLR.nltk import Set > >>> dir(Set) > ['__doc__', '__name__'] > >>> from CLR.nltk.Set import Set > >>> dir(Set) > ['Equals', 'Finalize', 'GetHashCode', 'GetType', 'MemberwiseClone', > 'ReferenceEquals', 'ToString', '__and__', '__call__', '__class__', > '__cmp__', '__contains__', '__delattr__', '__delitem__', '__doc__', > '__eq__', '__getattribute__', '__getitem__', '__hash__', '__init__', > '__iter__', '__len__', '__module__', '__new__', '__or__', '__reduce__', > '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__str__', > '__sub__', 'contains', 'copy', 'count', 'dict', 'difference', > 'elements', > 'f_measure', 'intersection', 'precision', 'recall', 'union'] > >>> a = Set(1) > Traceback (most recent call last): > File "<console>", line 1, in ? > TypeError: no constructor matches given arguments > >>> a = Set([1,2]) > >>> a > <CLR.nltk.Set.Set object at 0x072A7BD0> > >>> b = Set([5,3,2,1]) > >>> b > <CLR.nltk.Set.Set object at 0x072A7D30> > >>> b.contains(3) > True > >>> > __________________________________ Do you Yahoo!? Yahoo! Finance: Get your refund fast by filing online. http://taxes.yahoo.com/filing.html

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RE: [Python.NET] Using a .Net DLL
by Sean McKay March 12, 2004

March 12, 2004

My apologies! I'll add the Dict code.. (btw, some closing brackets are probably missing, as well as possibly some using statements, I was trying to cut stuff out for brevity). Thanks for looking at this... Sean using System; using System.Collections; using System.Collections.Specialized; using System.IO; namespace nltk { namespace probability { public delegate ProbDist CreateProbDistDelegate(FreqDist fdist, params object[] args); #region Helper Classes public class Dict: Hashtable { private ArrayList keys = new ArrayList(); public override object this[ object key ] { get { return( base[key] ); } set { if (!keys.Contains(key)) keys.Add(key); base[key] = value; } } public string[] GetKeys { get { string[] results = new string[keys.Count]; keys.CopyTo(results); return( results); } } public override string ToString() { string result = ""; foreach (string key in Keys) { result += key + ":" + base[key].ToString() + " "; } return result; } public override void Add( object key, object value ) { if (!keys.Contains(key)) keys.Add(key); base.Add(key, value); } public override void Remove( object key ) { keys.Remove(key); base.Remove( key ); } public int Length { get { return base.Count; } } } #endregion --- Thane <thane(a)magna-capital.com> wrote: > Sean, I can't get your C# code to compile. The complaint is about > "Dict". > <snipped> __________________________________ Do you Yahoo!? Yahoo! Search - Find what you�re looking for faster http://search.yahoo.com

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RE: [Python.NET] Showing modal .NET dialogs from Python
by Mike and Viv Kelly March 11, 2004

March 11, 2004

It will probably be a .DLL because it will be a .NET Assembly. --------------------------------- From: pythondotnet-bounces(a)python.org [mailto:pythondotnet-bounces@python.org] On Behalf Of Jill-Connie Lorentsen Sent: 11 March 2004 05:07 To: pythondotnet(a)python.org Subject: [Python.NET] Showing modal ..NET dialogs from Python Thanks for a quick response, Mike. Just one thing, - what kind of file is "MyColleaguesFile", .py, .cpp, .h, .dll...? (my colleague hasn't finished his part of the project yet, and he doesn't know much about this either...) Jill --------------------------------- Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now

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Showing modal .NET dialogs from Python
by Jill-Connie Lorentsen March 11, 2004

March 11, 2004

Thanks for a quick response, Mike. Just one thing, - what kind of file is "MyColleaguesFile", .py, .cpp, h, .dll...? (my colleague hasn't finished his part of the project yet, and he doesn't know much about this either...) Jill

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Showing modal .NET dialogs from Python
by Jill-Connie Lorentsen March 11, 2004

March 11, 2004

I am new to this, so please excuse me if I'm not making myself 100% clear. My colleague is writing a modal dialog using .NET. I want to show it from Python, but I can't figure out how. I guess it'll be something like: import CLR import CLR.System.Windows.Forms as MyForm from MyColleaguesFile import MyColleaguesForm MyForm = MyColleaguesForm MyForm.Show() I've looked at the helloform, splitter and wordwin examples, the mailinglist archive etc, but I feel like I'm missing something. Is it even possible to do what I want to do? Thanks! Jill

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