[Python beginner] Join two lists alternately (5 lines).

list1 = ['1', '2', '3']
list2 = ['hello', 'world']
result = [None]*(len(list1)+len(list2))
result[::2] = list1
result[1::2] = list2

print(result)#['1', 'hello', '2', 'world', '3']

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