When a rectangle on a canvas is clicked, how can I get the ID of that rectangle?

I have these set of rectangles drawn on a canvas. They are all bind to Button-1 event. What I like to do is set a variable with an id of a widget that invoke the event. Here's a pseudo code of what I like to do

def clicked(e): #event handler. Binds to rectangle objects
    selected_button = e.widgets.get_id()

P.S : Although I bind the event handler to those rectangles objects only, when I place code e.widget.destroy() inside that handler, the canvas is destroyed as well.

Executive summary

Since canvas method accept indifferently tags or items id, you can use the compact callback

def autodestroy(event):
    event.widget.delete("current")

Details

Your callback receive a Tkinter event as unique parameter. This parameter is an object from whom you can retrieve stimulated widget, as well as other informations (mouse coordinate or buttons in the case of a mouse event).

def clicked(event):
    canvas = event.widget

To get the clicked canvas item, you can either use the CURRENT¹ tag

    rect = canvas.find_withtag("current")[0]

or reproduce picking with find_closest, find_overlapping, find_enclosed ...(copied from effbot.org)

    canvas = event.widget
    x = canvas.canvasx(event.x)
    y = canvas.canvasy(event.y)
    rect = canvas.find_closest(x, y)[0]

Note that find_ family return tuples, that might be empty under some circumstance and you might test emptyness or catch exception.

Then to delete an item of a canvas, you can use canvas.delete method.

    canvas.delete(rect)

Since canvas method accept indifferently tags or items id, you can use a more compact writing:

def autodestroy(event):
    event.widget.delete("current")

¹ Tkinter.CURRENT and "current"are equivalent