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Answers and rating deltas for

How do I fix this 'NoneType' error in my code

Author Votes Δ
Pedro Lobito 1 +1.91
glibdud 0 -0.98
Mehrdad Pedramfar 0 -0.77
ruohola 0 -1.30
Last visited: Sep 4, 2019, 3:46:46 PM