sp_with_follow = ['one', 'two', 'three', 'four', 'five']
res_list = ['1', 2, '3', 4, 5]
out = []
for el in sp_with_follow:
res_copy = res_list[:]
res_copy.insert(4,el)
out.extend(res_copy)
print(out)
['1', 2, '3', 4, 'one', 5, '1', 2, '3', 4, 'two', 5, '1', 2, '3', 4, 'three', 5, '1', 2, '3', 4, 'four', 5, '1', 2, '3', 4, 'five', 5]
Process finished with exit code 0