在python的list操作中，常用的操作是向list中新增元素，具體有如下兩種方式：
採用「+」，這種方式會把兩個list中的元素合併為乙個list
l1 = [1, 2, 3]
l2 = [4, 5, 6]
l3 = l1 + l2
print(l3) # [1, 2, 3, 4, 5, 6]
print(l1) # [1, 2, 3, [4, 5, 6]]
print(l1.extend(l2)) # none 因為extend無返回值
print(l1) # [1, 2, 3, [4, 5, 6], 4, 5, 6]
l1 = [1, 2, 3]
print(l1) # [1, 2, 3]
l5 = [a + b for a,b in zip(l1, l2)] # 數值相加
print(l5) # [5, 7, 9]
l6 = [a - b for a, b in zip(l2, l1)] # 數值相減
print(l6) # [3, 3, 3]
l7 = [a * b for a, b in zip(l1, l2)] # 數值相乘
print(l7) # [4, 10, 18]
l8 = [a / b for a, b in zip(l2, l1)] # 數值相乘
print(l8) # [4.0, 2.5, 2.0]
l9 = l1 * 2 # 把列表擴充為重複原來兩次
print(l9) # [1, 2, 3, 1, 2, 3]
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