Get the selection of a wx.ComboBox in python

abstract.py

# line 37 in llm/view/dialog/library/abstract.py
        self.type = wx.ComboBox(panel,
                                -1,
                                choices=["CD/DVD/Blu-Ray", "Book/Magazine"],
                                style=wx.CB_READONLY)

        sbs.Add(self.build_line(wx.StaticText(panel, -1, "Type:"), self.type))

# new line 51 in llm/view/dialog/library/abstract.py

        choices_d = ['None']
        choices_i = [None]
        for data in patron_data:
            dd = "%s %s (%d)" % (data["first_name"],
                                 data["last_name"],
                                 data["id"])
            choices_d.append(dd)
            choices_i.append(data["id"])

        self.id_map = choices_i

# somewhere else in that file
    def get_selected_cob_id(self):
        sel = self.checked_out_by.GetCurrentSelection()
        return self.id_map[sel]

controller.py

# at line 113 in llm/controller.py


        item_data = {"name"         : self.add_lib_item_dlg.name.GetValue(),
                     "author_first" : self.add_lib_item_dlg.author_first_name.GetValue(),
                     "author_last"  : self.add_lib_item_dlg.author_last_name.GetValue(),
                     "desc"         : self.add_lib_item_dlg.desc.GetValue(),
                     "type"         : self.add_lib_item_dlg.type.GetValue(),
                     "cob"          : self.add_lib_item_dlg.get_selected_cob_id(),
                     "id"           : 0}