Python列表的复制

1.直接按名字赋值：

my_habit = ['game', 'running']
friend_habit = my_habit
my_habit.append('swimming')
friend_habit.append('pingpang')
print(my_habit)
print(friend_habit)

输出结果为：

['game', 'running', 'swimming', 'pingpang']
['game', 'running', 'swimming', 'pingpang']

 

这里将my_habit赋给friend_habit，而不是将my_habit的副本存储到friend_habit，这种语法其实是让Python将新变量friend_habit关联到包含在my_habit中的列表，因此这两个变量都是同一个列表。

2.创建新列表：

my_habit = ['game', 'running']
friend_habit = my_habit[:]
my_habit.append('swimming')
friend_habit.append('pingpang')
print(my_habit)
print(friend_habit)

输出结果为：

['game', 'running', 'swimming']
['game', 'running', 'pingpang']