Make a Spinbox that can be displayed in HEX with Tkinter

import tkinter as tk

class HexSpinbox(tk.Spinbox):
    def __init__(self, *args, **kwargs):
        self.var = tk.StringVar()
        self.bytenum = kwargs.pop('bytenum')
        max_val = 0x1<<(self.bytenum*8)
        super().__init__(*args, **kwargs, textvariable=self.var, from_=0,to=max_val,
                         increment=1, command=self.cange )

    def set(self, val):
        s = "0x{:0%dx}" % (self.bytenum*2)
        self.var.set(s.format(int(val)))
        
    def get(self):
        hstr = super().get()
        return int(hstr, 16)

    def cange(self):
        val = super().get()
        self.set(val)


if __name__ == "__main__":
    print("HexSpinbox")
    win = tk.Tk()
    hex = HexSpinbox(win, bytenum=2)
    hex.set(0xAA55)
    hex.pack()
    
    win.title("HexSpinbox test")
    win.mainloop()

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