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Week 7, ex 4.3 I don't get what i'm doing wrong win = GraphWin("Tetrominoes", 150, 150) point = Point(1, 1) color = 'black' def Block(Rectangle): def __init__(self, point1, color = 'black'): self.canvans = Rectangle(point, Point(point.x + 20, point.y + 20)) self.canvans.setFill(color) def draw(self, win): self.canvans.draw(win) rect = Block(point) rect.draw(win) win.mainloop() And result: File "E:/Python/test1/", line 26, in rect.canvans.draw(win) AttributeError: 'NoneType' object has no attribute 'canvans'

MIT 6.189 A Gentle Introduction to Programming Using Python (OCW)
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you want to define Block as a class, rather than a function: class Block: # no argument is needed here and then use either point or point1 consistantly between your self__init__ function and your rectangle definition.
Should the class not be derived from Rectangle? class Block(Rectangle): There its also a typo: canvans should be canvas. HTH.
Oh. I need more sleep. I had to write "class Block" instead of "def Block".

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