Hi All, I switched from a list to a dictionary of dictionaries, and it works as I needed it. Don't know if that's a performance hit or not, but hey it works. ..and yes I was retyping and had two typos (good eye!), should have been TypeError: 'List[book]' object is unsubscriptable not 'List[books]' object is unsubscriptable, and my code declared the book class methods as public.
Thank you all for your help. I'm sure this won't be my last question! -Larry -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Curt Hagenlocher Sent: Monday, June 08, 2009 3:02 PM To: Discussion of IronPython Subject: Re: [IronPython] How to reference List objects? It indicates a nested class: class PythonEngine { class book { } } You can definitely interact with BCL generic List classes in this fashion: >>> from System.Collections.Generic import List a = List[str]() >>> a.Add('abc') >>> a.Add('def') >>> a List[str](['abc', 'def']) >>> a[0] 'abc' >>> ^Z There are a number of subtle problems with the output text in the original report; was this typed in or copy-and-pasted? On Mon, Jun 8, 2009 at 1:55 PM, Justin Regele <[email protected]> wrote: Ah, I see. Would a python list then need to be called the way he is doing it, though. Is this a silverlight issue? I am wondering if he can just make a python list out of his Book C# class rather than exporting them as a list. I am sure there would be some performance issues, so maybe that is the reason for this way of doing it. Wondering about this error: System.Collections.Generic. List'1[testapp.PythonEngine+book] What does the '+' indicate? On Mon, Jun 8, 2009 at 1:32 PM, Michael Foord <[email protected]> wrote: Justin Regele wrote: Type Errors where the object is unscriptable means that it does not have any indices intialized. Use the python interactive interpreter to play around with list methods, and see how they work correctly. This is one of pythons best weapons. if you don't know what objects are in a module, or what attributes/methods are in a class type in dir(<module or classname>) and it will spell it out for you. you do need to initialize a list before access, however. so you CANT do this x = [] x[0] = 'something' you would have to do this(making a list of 10 None objects) x = [None] * 10 x[0] = 'something' OR use the append() method to make the list more like a dynamic array x = [] x.append('something') this is the python way of doing it, but i'm not sure why you need a .NET list array. He is creating the list from C# and making it available to Python code. As far as I can tell he is doing it right, although maybe the fact that his C# book class is private is interfering with it? Michael On Mon, Jun 8, 2009 at 11:27 AM, Larry Danberger <[email protected] <mailto:[email protected]>> wrote: Hi all, I'm new to Python and IronPython, sorry if this is obvious. I haven't found answer searching web or in IronPython In Action book... I have embedded IronPython into silverlight app for scripting, which is working (wow! Btw). I use scope.SetVariable for dictionaries which works as expected. However when passing in a list I am unable to access the objects within a list. For the example below when trying x = books[0].Name I get TypeError: 'List[books]' object is unsubscriptable If I do x = books I get back System.Collections.Generic.List'1[testapp.PythonEngine+book] If I do Len(books) I get back 4. How do I access them individually (by name etc.)? My code looks something like this: Class book { int ID { get; set; } String Name { get; set; } String Author { get; set; } String Description { get; set; } } ... List<book> _books = new List<book>(); _books.Add(new book { ID=1, Name="book1", Author="author1", Description="Description1"}); _books.Add(new book { ID=2, Name="book2", Author="author2", Description="Description2"}); _books.Add(new book { ID=3, Name="book3", Author="author3", Description="Description3"}); _books.Add(new book { ID=4, Name="book4", Author="author4", Description="Description4"}); ... _scope.SetVariable("books", _books); Any help appreciated, thanks! -Larry _______________________________________________ Users mailing list [email protected] <mailto:[email protected]> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com ------------------------------------------------------------------------ _______________________________________________ Users mailing list [email protected] http://lists.ironpython.com/listinfo.cgi/users-ironpython.com -- http://www.ironpythoninaction.com/ http://www.voidspace.org.uk/blog _______________________________________________ Users mailing list [email protected] http://lists.ironpython.com/listinfo.cgi/users-ironpython.com _______________________________________________ Users mailing list [email protected] http://lists.ironpython.com/listinfo.cgi/users-ironpython.com _______________________________________________ Users mailing list [email protected] http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
