wxpython: ListBox object has no attribute 'GetItems'

browny_amiga · 04-03-2009, 08:44 PM

I am trying to execute the code here:

http://www.python-forum.org/pythonfo...hp?f=2&t=10297

name_list = self.listbox.GetItems()
AttributeError: 'ListBox' object has no attribute 'GetItems'

which is pretty standard and get the error in the subject. There is supposed to be a Method GetItems in Python, in wx, but I don't get it why I am getting this error Message. This is on Debian Lenny.

Markus

Hko · 04-04-2009, 03:55 PM

Quote:

Originally Posted by browny_amiga

I am trying to execute the code here:
http://www.python-forum.org/pythonfo...hp?f=2&t=10297

name_list = self.listbox.GetItems()
AttributeError: 'ListBox' object has no attribute 'GetItems'

which is pretty standard and get the error in the subject. There is supposed to be a Method GetItems in Python, in wx, but I don't get it why I am getting this error Message.

Why didn't you just have a look at the code?

Code:

    def sort_buttonClick(self, event):
        """sort the items in the listbox"""
        # GetItems() is new in wxPython2.8
        # puts the listbox items into a list
        name_list = self.listbox.GetItems()
        name_list.sort()
        # Set() clears and reloads the listbox
        self.listbox.Set(name_list)

browny_amiga · 04-04-2009, 05:06 PM

Oh, so very true. Blast, I expected some other stranger problem to be the cause.

Is there any other function before 2.8 that will return the selected (string) list, instead of numbers?

Markus

Hko · 04-05-2009, 07:03 AM

Quote:

Originally Posted by browny_amiga

Is there any other function before 2.8 that will return the selected (string) list, instead of numbers?

Not ready-made.
But it isn't too difficult to make one.

Here's a complete working example:

Code:

#!/usr/bin/env python

import wx

# Creating a new ListBox class that supports the GetItems() method
# like in wx version 2.8
#
class OurSlightlyEnhancedListBox(wx.ListBox): # inheriting wx.ListBox class

    # Need to define construstor, but it can just call the inherited one.
    # A lot of parameters, but just pass them on. Not complex as it may seem.
    #
    def __init__(self, parent, id=wx.ID_ANY, pos=wx.DefaultPosition, 
                 size=wx.DefaultSize, choices=[], style=0,
                 validator=wx.DefaultValidator, name=wx.ListBoxNameStr):
        wx.ListBox.__init__(self, parent, id, pos, size, choices, style, validator, name)

    # Adding Home-made GetItems() method
    def GetItems(self):

        # First create the list we are going to fill and return
        result = []

        # From the docs we know we can get an item from the listbox
        # with the GetString(<index>). So we need to loop over the
        # <index>. For that we first need to know how many there are.
        # We can get that with the GetCount method of the ListBox class
        # from wx version before v2.8.
        #
        # (note that we inherited GetCount and GetString from wx.ListBox)
        #
        for index in range(self.GetCount()): 
            result.append(self.GetString(index))
        
        # Finshed filling the result list here. Now just return it.
        return result


# Create out own window for simple demonstration program
#
class MainWindow(wx.Frame):
    def __init__(self, parent, title, size=wx.DefaultSize):
        wx.Frame.__init__(self, parent, wx.ID_ANY, title, wx.DefaultPosition, size)
        
        # Create an instance of the new ListBox class
        self.listbox =  OurSlightlyEnhancedListBox(self, wx.ID_ANY)

        # Just add some items.
        self.listbox.InsertItems(["one", "two", "three", "four", "five"], 0)

        # Now do the same as GetItems() in wxPython v2.8 on the listbox
        # and print the items to the stdout (the terminal).
        itemlist = self.listbox.GetItems()
        for item in itemlist:
            print item

# Start the thing:
#
def main():
    app = wx.App()
    win = MainWindow(None, "The Listbox")
    win.Show()
    app.MainLoop()

browny_amiga · 04-06-2009, 06:42 PM

thanks for the code. I also wrote a workaround in the meanwhile. Am I the only one that thinks that this is really strange, that this feature, that is so basic and common sense has only been integrated in this newest version?
The indirect approach, of getting the number of the item was there before the direct one, with the string returned on the selection.

;-)

Markus

Hko · 04-07-2009, 02:33 AM

Quote:

Originally Posted by browny_amiga

Am I the only one that thinks that this is really strange, that this feature, that is so basic and common sense has only been integrated in this newest version?

I agree that seems very basic and common sense. But, that is from a python point of view. Keep in mind that wxPython is a binding, a wrapper, library for what is essentially a C++ lib. And in C++ there's no lists (not the way lists exists in python).

Very often you don't really need to make a list of he items of a listbox: many times you would fill the listbox from a list you already have, or you just want to iterate over the items in a loop.

With the listbox-methods that existed before wx v2.8 it was already pretty trivial to loop over the items in a ListBox. you only had to dive a little deeper in the doc's to see how to do it:

Code:

for index in range(MyListBox.GetCount()): 
            print MyListBox.GetString(index))

browny_amiga · 04-10-2009, 10:58 PM

Well, yes, that makes perfect sense there. Totally forgot that point. It is a wrapper and therefore C rules how it is laid out.

Cheers

Markus