python中listctrl控件排序，里面的数据映射是咋回事，数据字典的组织形式呢？网下的资料，都是不附带字典的

import wx
import wx.lib.mixins.listctrl as listmix
 
musicdata = {
0 : ("Bad English", "The Price Of Love", "Rock"),
1 : ("DNA featuring Suzanne Vega", "Tom's Diner", "Rock"),
2 : ("George Michael", "Praying For Time", "Rock"),
3 : ("Gloria Estefan", "Here We Are", "Rock"),
4 : ("Linda Ronstadt", "Don't Know Much", "Rock"),
5 : ("Michael Bolton", "How Am I Supposed To Live Without You", "Blues"),
6 : ("Paul Young", "Oh Girl", "Rock"),
}
 
########################################################################
class TestListCtrl(wx.ListCtrl):
 
    #----------------------------------
    def __init__(self, parent, ID=wx.ID_ANY, pos=wx.DefaultPosition,
                 size=wx.DefaultSize, style=0):
        wx.ListCtrl.__init__(self, parent, ID, pos, size, style)
 
########################################################################
class TestListCtrlPanel(wx.Panel, listmix.ColumnSorterMixin):
 
    #----------------------------------
    def __init__(self, parent):
        wx.Panel.__init__(self, parent, -1, style=wx.WANTS_CHARS)
 
        self.index = 0
 
        self.list_ctrl = TestListCtrl(self, size=(-1,100),
                         style=wx.LC_REPORT
                         |wx.BORDER_SUNKEN
                         |wx.LC_SORT_ASCENDING
                         )
        self.list_ctrl.InsertColumn(0, "Artist")
        self.list_ctrl.InsertColumn(1, "Title", wx.LIST_FORMAT_RIGHT)
        self.list_ctrl.InsertColumn(2, "Genre")
 
        items = musicdata.items()
        index = 0
        for key, data in items:
            self.list_ctrl.InsertStringItem(index, data[0])
            self.list_ctrl.SetStringItem(index, 1, data[1])
            self.list_ctrl.SetStringItem(index, 2, data[2])
            self.list_ctrl.SetItemData(index, key)
            index += 1
 
        # Now that the list exists we can init the other base class,
        # see wx/lib/mixins/listctrl.py
        self.itemDataMap = musicdata
        listmix.ColumnSorterMixin.__init__(self, 3)
        self.Bind(wx.EVT_LIST_COL_CLICK, self.OnColClick, self.list_ctrl)
 
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.list_ctrl, 0, wx.ALL|wx.EXPAND, 5)
        self.SetSizer(sizer)
 
    #----------------------------------
    # Used by the ColumnSorterMixin, see wx/lib/mixins/listctrl.py
    def GetListCtrl(self):
        return self.list_ctrl
 
    #----------------------------------
    def OnColClick(self, event):
        print "column clicked"
        event.Skip()
 
########################################################################
class MyForm(wx.Frame):
 
    #----------------------------------
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "List Control Tutorial")
 
        # Add a panel so it looks the correct on all platforms
        panel = TestListCtrlPanel(self)
 
#----------------------------------
# Run the program
if __name__ == "__main__":
    app = wx.App(False)
    frame = MyForm()
    frame.Show()
    app.MainLoop()

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