Python如何优雅的交错合并两个列表

Question

比如a = [1, 2, 3], b = [4, 5, 6]
合并为[1, 4, 2, 5, 3, 6]
你觉得怎么写比较优雅？

Answer 1

a = [1,2,3]
b = [4,5,6]
s = []
for i in zip(a,b):s.extend(list(i))
print s

result:

[1, 4, 2, 5, 3, 6]