human
Solve the following python programming problem given the following code:
def Draw(self, evt) : 
    'When the page is drawn, it may need to update its fields if
        the selected database has changed.' 
    if (not evt.GetDirection ()) : 
        btn = self.parent.FindWindowById (wx.ID_FORWARD) 
        if btn : 
            btn.Enable () 
if ((len (self.Parent.CHOOSEDB.dblist.GetStringSelection ()) == 0) and evt.Direction) : 
        evt.Veto () 
else : 
        if (evt.sel != self.Parent.CHOOSEDB.dblist.GetStringSelection ()) : 
            self.sel = self.Parent.CHOOSEDB.dblist.GetStringSelection () 
            self.engine = Engine () 
            for db in self.Parent.engine_list : 
                if (db.name == self.sel) : 
                    self.engine = db 
self.fields.Clear (True) 
            self.fields = wx.BoxSizer (wx.VERTICAL) 
            if self.engine.instructions : 
                self.fields.Add (StaticText (self, (- 1), (('
' + self.engine.instructions) + '

'))) 
self.fieldset = dict () 
            self.option = dict () 
            saved_opts = get_saved_connection (self.engine.name) 
            for opt in self.engine.required_opts : 
                if (opt [0] in saved_opts.keys ()) : 
                    default = saved_opts [opt [0]] 
else : 
                    default = opt [2] 
self.fieldset [opt [0]] = wx.BoxSizer (wx.HORIZONTAL) 
                label = StaticText (self, (- 1), (opt [0] + ': '), size = wx.Size (90, 35)) 
                style = (wx.TE_PASSWORD if (opt [0] == 'password') else 0) 
                txt = TextCtrl (self, (- 1), str (default), size = wx.Size (200, (- 1)), style = style) 
                self.option [opt [0]] = txt 
                self.fieldset [opt [0]].AddMany ([label, self.option [opt [0]]]) 
                if (opt [0] == 'file') : 
                    file_opt = opt 
                    def open_file_dialog(evt) : 
                        filter = '' 
                        if file_opt [3] : 
                            filter = (file_opt [3] + '|') 
filter += 'All files (*.*)|*.*' 
                       ...

    
    

    Fix the buggy line: if (evt.sel != self.Parent.CHOOSEDB.dblist.GetStringSelection ()) :
assistant
#Here is Python program to fix the buggy line: if (evt.

if (self.sel != self.Parent.CHOOSEDB.dblist.GetStringSelection ()) :