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Re:A “One” Line Echo Server Using “let” in Python by rnhmjoj on Thursday November 13, 2014 @03:46PM (#8603959)
Great! I have never thought about using optional parameters in lambdas. A useful new technique for golfing.

I would use all() instead of the "== None" trick and __import__().

http://hastebin.com/nemiyukenu.python