turtle.onrelease(fun, btn=1, add=None) 
| Parameters: | 
  |  
|---|
Bind fun to mouse-button-release events on this turtle. If fun is None, existing bindings are removed.
>>> class MyTurtle(Turtle):
...     def glow(self,x,y):
...         self.fillcolor("red")
...     def unglow(self,x,y):
...         self.fillcolor("")
...
>>> turtle = MyTurtle()
>>> turtle.onclick(turtle.glow)     # clicking on turtle turns fillcolor red,
>>> turtle.onrelease(turtle.unglow) # releasing turns it to transparent.
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