[Python] How do I reference the rectangles individually? [closed]

I'm trying to make a checklist, the idea is that you can check off the boxes when pressed, but I can't think of a way to reference which box was checked so I can blackout the checkbox

cursor=Label('|',40,40,size=24)
Rect(15,32,20,20,fill='white',border='black')

###create tasks###
def onKeyPress(key):
if(key=='enter'):
cursor.centerX=40
cursor.centerY+=25
box=Rect(15,cursor.centerY-5,20,20,fill=None,border='black')
elif(key=='space'):
Label(' ',cursor.centerX,cursor.centerY,size=15)
cursor.centerX+=10
elif(key=='backspace'):
pass
else:
Label(key,cursor.centerX,cursor.centerY,size=15)
cursor.centerX+=10

def onMousePress(mouseX,mouseY):

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