根据您的注解，一个选项是将函数放入一个类中，该类记录绘图是否已创建，并具有一个类方法，仅在绘图不存在时绘制该绘图。例如：

class Plotter:
    def __init__(self):
        self._plot_exists = False  # no plot

    def plot_cr(self):
        if not self._plot_exists:
            # create plot if no plot exists
            section_length = 220
            section_width = 220
            angle = np.linspace(np.pi, 3 * np.pi / 2, 150)
            side_view_width = float(section_width) / 100
            outer_radius = float(12) + side_view_width
            x = float(12) * np.cos(angle)
            y = float(12) * np.sin(angle)
            fig1 = Figure(figsize=(10, 10), dpi=60)
            axes = fig1.add_subplot(111)
            axes.clear()
            axes.plot(x, y, color="green")
            axes.set_aspect(1)
            axes.set_title('Caster Diagram')
            canvas_side = FigureCanvasTkAgg(fig1, master=caster_graph)
            canvas_side.draw()
            canvas_side.get_tk_widget().pack(side="left", fill="both", expand=True)
            axes.get_xaxis().set_visible(False)
            axes.get_yaxis().set_visible(False)
            plt.rcParams['axes.formatter.useoffset'] = False
            fig1.tight_layout()

            # set _plot_exists to True
            self._plot_exists = True

plotter = Plotter()  # create instance of class
plot_button = Button(
    master=cnozzle,
    command=plotter.plot_cr,  # pass the class function
    height=1,
    width=20,
    text="Get Cooling Profile"
)
plot_button.grid(row=2, column=0, padx=25, columnspan=2, pady=5)