class ProgressBar(tk.Canvas):

    def __init__(self, master):

        super().__init__(master)

        self._c=Canvas(master, width=400, height=50)
        self._c.pack()


    def update_bar(self, moves):
        bar=self._c.create_rectangle(0, 0, 50, 20, fill="purple", width=0)
        x0, y0, x1, y1 = self._c.coords(bar)
        for i in str(moves):
            if x1<=300:
                self._c.coords(bar, x0, y0, x1*(20-moves), y1)
                print(x1)
            elif x1>300:
                self._c.coords(bar, x0, y0, 50, y1)