Expandable and contracting frame in Tkinter

I am actually surprised at how close I was to getting functioning code. I decided to work on it some more and have develop a simple little class to perform exactly what I wanted (comments and suggestions on the code are welcome):

import tkinter as tkfrom tkinter import ttk class ToggledFrame(tk.Frame):    def __init__(self, parent, text="", *args, **options):        tk.Frame.__init__(self, parent, *args, **options)        self.show = tk.IntVar()        self.show.set(0)        self.title_frame = ttk.Frame(self)        self.title_frame.pack(fill="x", expand=1)        ttk.Label(self.title_frame, text=text).pack(side="left", fill="x", expand=1)        self.toggle_button = ttk.Checkbutton(self.title_frame, width=2, text='+', command=self.toggle,                                            variable=self.show, style='Toolbutton')        self.toggle_button.pack(side="left")        self.sub_frame = tk.Frame(self, relief="sunken", borderwidth=1)    def toggle(self):        if bool(self.show.get()):            self.sub_frame.pack(fill="x", expand=1)            self.toggle_button.configure(text='-')        else:            self.sub_frame.forget()            self.toggle_button.configure(text='+')if __name__ == "__main__":    root = tk.Tk()    t = ToggledFrame(root, text='Rotate', relief="raised", borderwidth=1)    t.pack(fill="x", expand=1, pady=2, padx=2, anchor="n")    ttk.Label(t.sub_frame, text='Rotation [deg]:').pack(side="left", fill="x", expand=1)    ttk.Entry(t.sub_frame).pack(side="left")    t2 = ToggledFrame(root, text='Resize', relief="raised", borderwidth=1)    t2.pack(fill="x", expand=1, pady=2, padx=2, anchor="n")    for i in range(10):        ttk.Label(t2.sub_frame, text='Test' + str(i)).pack()    t3 = ToggledFrame(root, text='Fooo', relief="raised", borderwidth=1)    t3.pack(fill="x", expand=1, pady=2, padx=2, anchor="n")    for i in range(10):        ttk.Label(t3.sub_frame, text='Bar' + str(i)).pack()    root.mainloop()

This code produces:

To my knowledge, Tkinter/ttk does no provide such widgets. You might mimic your example (expand/collapse label list) with a tkinter.ttk.Treeview.

It is perfectly acceptable¹ to develop your own widgets, and your code seems a right start.