Re: Question about None

[Jean-Michel Pichavant]

  def setNext(nxt):
    assert nxt==None or isinstance(nxt, Node), "next must be a Node"
    self.next = nxt
works ok, but it's uglier than it ought to be.

  
I don't find it that ugly. It's accurate, easy to read and understand. 
"What else ?" would say a famous coffee representative.
If you like perfection, replace nxt==None by nxt is None.

Jean-Michel
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