程式碼：

import copy
class Obj():
    def __init__(self,arg):
        self.x=arg
if __name__ == '__main__':
    obj1=Obj(1)
    obj2=Obj(2)
    obj3=Obj(3)
    obj4=Obj(4)
    lst=[obj1,obj2,obj3,obj4]
    lst1=lst
    lst2=copy.copy(lst)
    lst3=copy.deepcopy(lst)
    print(id(lst),id(lst1),id(lst2),id(lst3))
 

(37271888, 37271888, 37688456, 37271816)

print id(lst),'------>',
    for obj in lst:
        print id(obj),
    print ''
    print id(lst2),'------>',
    for obj in lst2:
        print id(obj),
    print ''
    print id(lst3),'------>',
    for obj in lst3:
        print id(obj),
 

13887824 ------> 13888184 13939704 13938768 13941864 
13960256 ------> 13888184 13939704 13938768 13941864 
13887752 ------> 13960184 13960544 13960616 13960688

官網對二者區別的描述：

The difference between shallow and deep copying is only relevant for compound objects (objects that contain other objects, like lists or class instances):

• A shallow copy constructs a new compound object and then (to the extent possible) inserts references into it to the objects found in the original.
• A deep copy constructs a new compound object and then, recursively, inserts copies into it of the objects found in the original.