list中 append 与 extend

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a = [1,2,3]
b = [4,5,6]
# 无返回值，错误写法 ==》a=a.append(b)
a.append(b)
print(a)
# [1, 2, 3, [4, 5, 6]]
a.extend(b)
print(a)
# [1, 2, 3, [4, 5, 6], 4, 5, 6]