关于python：需要求和a，b，c，除非它们等于13,14,17,18,19

Need to sum a,b,c, unless they equal 13,14,17,18,19

这是我的任务：

Given 3 int values, a b c, return their sum. However, if any of the values is a teen -- in the range 13..19 inclusive -- then that value counts as 0, except 15 and 16 do not count as a teens. Write a separate helper"def fix_teen(n):"that takes in an int value and returns that value fixed for the teen rule. In this way, you avoid repeating the teen code 3 times (i.e."decomposition"). Define the helper below and at the same indent level as the main no_teen_sum().

我唯一能想到的解决方案是：

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excep = [13,14,17,18,19]

def no_teen_sum(a, b, c):
if a in excep and b in excep and c in excep:
return 0
elif a in excep and b in excep and c not in excep:
return c
elif b in excep and c in excep and a not in excep:
return a
elif a in excep and c in excep and b not in excep:
return b
elif a in excep and b not in excep and c not in excep:
return b+c
elif b in excep and a not in excep and c not in excep:
return a+c
elif c in excep and a not in excep and b not in excep:
return a+b
else:
return a+b+c