python使用运算符实现列表扩展

listA = [1, 2, 3]

listB = [4, 5, 6, 7]

print(listA, "addr:0x%x" % id(listA))

print(listB, "addr:0x%x" % id(listB))

listC = listA + listB    # 拼接结果存放在重新分配内存空间中

print(listC, "addr:0x%x" % id(listC))

[1, 2, 3] addr:0x1be35d25208

[4, 5, 6, 7] addr:0x1be35d25408

[1, 2, 3, 4, 5, 6, 7] addr:0x1be35e5a908

listA = [1, 2, 3]

listB = [4, 5, 6, 7]

print(listA, "addr:0x%x" % id(listA))

print(listB, "addr:0x%x" % id(listB))

listA += listB      # 在原有listA的空间后追加listB的所有成员

print(listA, "addr:0x%x" % id(listA))

[1, 2, 3] addr:0x1f24ab351c8

[4, 5, 6, 7] addr:0x1f24ab353c8

[1, 2, 3, 4, 5, 6, 7] addr:0x1f24ab351c8