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interactive use of turtle.py becomes impossible,
e.g.when issuing tracer(0) because in this
case apparently updating of Canvas-Widget is
deferred ...
... until the next tracer(1)
(one can observe this when running the demo() )
Inserting a _canvas.update() call in _draw_turtle()
for the case that tracing is off seems to work:
 def _draw_turtle(self,position=[]):
 if not self._tracing:
 self._canvas.update() # <== insert this line!
 return
 if position == []: # etc.etc.
I have attached a corrected version as turtle_.py
Gregor Lingl