def append_chords(self, chords=[]):
        '''pass a [list] of Chords to the Accordion object'''

        self.update_idletasks()
        row = 0
        width = max([c.winfo_reqwidth() for c in chords])
        
        for c in chords:
            i = PhotoImage() # blank image to force Label to use pixel size
            label = Label(self, text=c.title,
                          image=i,
                          compound='center',
                          width=width,
                          bg=self.style['title_bg'],
                          fg=self.style['title_fg'],
                          bd=2, relief='groove')
            
            label.grid(row=row, column=0)
            c.grid(row=row+1, column=0, sticky='nsew')
            c.grid_remove()
            row += 2
            
            label.bind('<Button-1>', lambda e,
                       c=c: self._click_handler(c))
            label.bind('<Enter>', lambda e,
                       label=label, i=i: label.config(bg=self.style['highlight']))
            label.bind('<Leave>', lambda e,
                       label=label, i=i: label.config(bg=self.style['title_bg']))
pass a [list] of Chords to the Accordion object
recipes/Python/578911_Accordion_Widget_Tkinter/recipe-578911.py