How should I write the code so that when I click on any circle with the same mouse button, the circle turns blue?

Windows, PyCharm, Python, tkinter, Canvas, program question There are three circles in the tkinter Canvas code with different colors. I want it to call the recolor method when I click on a circle. Unfortunately, I just can’t specify the If else conditions. I want to click with the same mouse button. The first round is ok, but the rest of the rounds are not! How should I write the code so that when I click on any circle with the same mouse button, the circle turns blue?

import tkinter as tk

class CanvasEvents(tk.Tk):
    def __init__(self):
        super().__init__()
        self.geometry('510x510+700+100')
        self.title("Event")

        self.canvas = tk.Canvas(self, bg='grey', width=500, height=500)
        self.canvas.pack(pady=5)

        kor1 = self.canvas.create_oval(20, 20, 100, 100, width=2, fill="orange")
        kor2 = self.canvas.create_oval(220, 20, 300, 100, width=2, fill="red")
        kor3 = self.canvas.create_oval(420, 20, 500, 100, width=2, fill="green")

        self.canvas.tag_bind(kor1, '<Button-1>', self.object_click_event)
        self.canvas.tag_bind(kor2, '<Button-1>', self.object_click_event)
        self.canvas.tag_bind(kor3, '<Button-1>', self.object_click_event)

    def object_click_event(self, event):
        # If else ?????????????????????
        self.canvas.itemconfigure(event.num, fill="blue")
        print('Clicked object at: ', self.canvas.coords(event.num), event.num)


if __name__ == "__main__":
    ablak = CanvasEvents()
    ablak.mainloop()