sum of arithmetic sequence (snippet)

Python example 'sum of arithmetic sequence'

sum of arithmetic sequence

Python beginners example: sum of arithmetic sequence

class ArithmeticSequence():
    def __init__ (self, seq):
        self.seq = seq 

    def sum(self):
        summed = len(self.seq) / 2 * (self.seq[0] + self.seq[-1])
        return summed 

test_sub = [2,4,6,8,10,12,14,16]        
print(ArithmeticSequence(test_sub).sum())        
print(sum(test_sub))

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