>>> charles = {‘name‘: ‘Charles L. Dodgson‘, ‘born‘: 1832}
>>> lewis = charles
>>> lewis is charles
True
>>> id(charles)
139996185268800
>>> id(lewis)
139996185268800
2.相等性的例子
>>> charles = {‘name‘: ‘Charles L. Dodgson‘, ‘born‘: 1832}
>>> alex = {‘name‘: ‘Charles L. Dodgson‘, ‘born‘: 1832}
>>> alex == charles
True
>>> alex is charles
False
>>> id(alex)
139996185193136
>>> id(charles)
139996185268800
复制列表（或多数内置的可变集合）最简单的方式是使用内置的类型构造方法。
>>> l1 = [12,123,22,213,222,1221] >>> l2 = list(l1) >>> l2 == l1 True >>> l2 is l1 False
>>> l1 = [3, [66,55,44], (7,8,9)] >>> l2 = l1[:] >>> l1.append(100) >>> l1 [3, [66, 55, 44], (7, 8, 9), 100] >>> l1[1].remove(55) >>> print(‘l1‘, l1) l1 [3, [66, 44], (7, 8, 9), 100] >>> print(‘l2‘, l2) l2 [3, [66, 44], (7, 8, 9)] >>> l2[1] += [33,22] >>> l2[2] += (10,11) >>> print(‘l1‘, l1) l1 [3, [66, 44, 33, 22], (7, 8, 9), 100] >>> print(‘l2‘, l2) l2 [3, [66, 44, 33, 22], (7, 8, 9, 10, 11)]
import copy
class Bus(object):
def __init__(self, passengers=None):
if passengers is None:
self.passengers = []
if passengers is not None:
self.passengers = list(passengers)
def drop(self, name):
self.passengers.remove(name)
def pick(self, name):
self.passengers.append(name)
bus1 = Bus([‘Alice‘, ‘Bill‘, ‘Claire‘, ‘David‘])
bus2 = copy.copy(bus1)
bus3 = copy.deepcopy(bus1)
bus1.drop(‘Bill‘)
bus1.pick(‘tom‘)
print(bus1.passengers)
print(bus2.passengers)
print(bus3.passengers)
# -------------------------
# bus1 [‘Alice‘, ‘Claire‘, ‘David‘, ‘tom‘]
# bus2 [‘Alice‘, ‘Claire‘, ‘David‘, ‘tom‘]
# bus3 [‘Alice‘, ‘Bill‘, ‘Claire‘, ‘David‘]
浅复制时，bus1和bus2，公用了一个列表对象，这个是可变对象
原文：https://www.cnblogs.com/dadaizi/p/11964718.html