列表-Ⅴ-拷贝深浅

BrightXiong

>>> # 浅拷贝：利用列表的从copy()方法、切片来实现
>>> x = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> y = x.copy()
>>> x[1][1] = 0
>>> x
[[1, 2, 3], [4, 0, 6], [7, 8, 9]]
>>> y
[[1, 2, 3], [4, 0, 6], [7, 8, 9]]

>>> # 将对象拷贝时，也将对象中所有引用对象一并进行拷贝
>>> # 深拷贝：利用copy模块的deepcopy()函数来实现
>>> a = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> import copy
>>> b = copy.deepcopy(a)
>>> a[1][1] = 0
>>> a
[[1, 2, 3], [4, 0, 6], [7, 8, 9]]
>>> b
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]