Changes

See the file TurtleArtActivity.py. This is where it starts. When an instance of TurtleArtActivity is created, setup_canvas() creates an instance of TurtleArtWindow: self.tw This instance of TurtleArtWindow creates an instance of  LogoCode: self.tw.lc and an instance of TurtleGraphics: self.tw.canvas

See the file TurtleArtActivity.py. This is where it starts. When an instance of TurtleArtActivity is created, setup_canvas() creates an instance of TurtleArtWindow: self.tw This instance of TurtleArtWindow creates an instance of  LogoCode: self.tw.lc and an instance of TurtleGraphics: self.tw.canvas

tamyblock.py gets passed a LogoCode instance, lc, and everything is relative to that instance.  tw is passed to lc and set as an instance data object at init. This allows referral back to tw when needed. Consequently,  

tamyblock.py gets passed a LogoCode instance, lc, and everything is relative to that instance.  tw is passed to lc and set as an instance data object at init. This allows referral back to tw when needed. Consequently, Class TurtleArtWindow is accessed through lc.tw. and