列表的使用---深浅copy的区别

  最原始的代码段：

#author：Mary
names=["zhangsan", "lisi", "wangwu",[ "mary","joy"],"zhaoliu","xiaobing"]
names2=names.copy()
print(names)
print(names2)
names[2]=" 王五"
names[3][0]="MARY"
print(names)
print(names2)

刚刚犯了错，直接把names.copy(） 写成copy（names）

编译结果

D:\Python36\python.exe C:/Users/10571/PycharmProjects/untitled/day1/day2/__init__.py
['zhangsan', 'lisi', 'wangwu', ['mary', 'joy'], 'zhaoliu', 'xiaobing']
['zhangsan', 'lisi', 'wangwu', ['mary', 'joy'], 'zhaoliu', 'xiaobing']
['zhangsan', 'lisi', ' 王五', ['MARY', 'joy'], 'zhaoliu', 'xiaobing']
['zhangsan', 'lisi', 'wangwu', ['MARY', 'joy'], 'zhaoliu', 'xiaobing']

改names跟names2，结果都一样

引入copy模块，使用浅copy函数，结果跟上面一样

#author：Mary
import copy
names=["zhangsan", "lisi", "wangwu",[ "mary","joy"],"zhaoliu","xiaobing"]
names2=copy.copy(names)
print(names)
print(names2)
names[2]=" 王五"
names[3][0]="MARY"
print(names)
print(names2)

D:\Python36\python.exe C:/Users/10571/PycharmProjects/untitled/day1/day2/__init__.py ['zhangsan', 'lisi', 'wangwu', ['mary', 'joy'], 'zhaoliu', 'xiaobing'] ['zhangsan', 'lisi', 'wangwu', ['mary', 'joy'], 'zhaoliu', 'xiaobing'] ['zhangsan', 'lisi', ' 王五', ['MARY', 'joy'], 'zhaoliu', 'xiaobing'] ['zhangsan', 'lisi', 'wangwu', ['MARY', 'joy'], 'zhaoliu', 'xiaobing']

Process finished with exit code 0

深copy

#author：Mary
import copy
names=["zhangsan", "lisi", "wangwu",[ "mary","joy"],"zhaoliu","xiaobing"]
names2=copy.deepcopy(names)
print(names)
print(names2)
names[2]=" 王五"
names[3][0]="MARY"
print(names)
print(names2)

结果：

D:\Python36\python.exe C:/Users/10571/PycharmProjects/untitled/day1/day2/__init__.py ['zhangsan', 'lisi', 'wangwu', ['mary', 'joy'], 'zhaoliu', 'xiaobing'] ['zhangsan', 'lisi', 'wangwu', ['mary', 'joy'], 'zhaoliu', 'xiaobing'] ['zhangsan', 'lisi', ' 王五', ['MARY', 'joy'], 'zhaoliu', 'xiaobing'] ['zhangsan', 'lisi', 'wangwu', ['mary', 'joy'], 'zhaoliu', 'xiaobing']

Process finished with exit code 0