We will create a couple of items that can be dragged and dropped with the mouse—a rectangle and an oval. The different shapes help us to note how the click events are correctly applied to the corresponding item, even though the items are placed overlapping each other:

import tkinter as tk

class App(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("Drag and drop")

        self.dnd_item = None
        self.canvas = tk.Canvas(self, bg="white")
        self.canvas.pack()

        self.canvas.create_rectangle(30, 30, 60, 60, fill="green",
                                     tags="draggable")
        self.canvas.create_oval(120, 120, 150, 150, fill="red",
                                tags="draggable")
        self.canvas.tag_bind("draggable", "<ButtonPress-1>",
                             self.button_press)
        self.canvas.tag_bind("draggable", "<Button1-Motion>",
                             self.button_motion)

    def button_press(self, event):
        item = self.canvas.find_withtag(tk.CURRENT)
        self.dnd_item = (item, event.x, event.y)

    def button_motion(self, event):
        x, y = event.x, event.y
        item, x0, y0 = self.dnd_item
        self.canvas.move(item, x - x0, y - y0)
        self.dnd_item = (item, x, y)

if __name__ == "__main__":
    app = App()
    app.mainloop()