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import tkinter as tk

APP_TITLE = "My Spinbox"

class MyWidget(tk.Frame):
    def __init__(self, app_win, **options):
        tk.Frame.__init__(self, app_win, **options)
        self.app_win = app_win
        
        spin_var = tk.IntVar(app_win, 5)
        spinbox = tk.Spinbox(self, textvariable=spin_var, increment=1, from_=0,
            to=10, width=6, justify='right', font=("Helvetica", 16))
        spinbox.pack(expand=True)
        

def main():
    app_win = tk.Tk()
    app_win.title(APP_TITLE)
    
    my_widget = MyWidget(app_win)
    my_widget.pack(fill='both', expand=True, padx=50, pady=10)
            
    app_win.mainloop()

main()