Python学习记录-类的浅拷贝和深拷贝

 变量的赋值操作

class CPU:
    pass


class Disk:
    pass


class Computer:
    def __init__(self, cpu, disk):
        self.cpu = cpu
        self.disk = disk


# (1)变量的赋值
cpu1 = CPU()  # 实例对象
cpu2 = cpu1
print(cpu1)  # <__main__.CPU object at 0x0000022B76D7F580>
print(cpu2)  # <__main__.CPU object at 0x0000022B76D7F580>
print(id(cpu1))  # 1837978484640
print(id(cpu2))  # 1837978484640

 浅拷贝

# (2)类的浅拷贝  只拷贝源对象，子对象不拷贝
print('------------------------')
disk = Disk()  # 创建一个Disk类的对象
computer = Computer(cpu1,disk)  # 创建一个Computer类的对象
# 浅拷贝
import copy
print(disk)  # <__main__.Disk object at 0x0000021E7CBC7EE0>
computer2 = copy.copy(computer)
print(computer,computer.cpu,computer.disk)  # <__main__.Computer object at 0x000002221AFC7EB0> <__main__.CPU object at 0x000002221AFC7FD0> <__main__.Disk object at 0x000002221AFC7EE0>
print(computer2,computer2.cpu,computer2.disk)  # <__main__.Computer object at 0x000002221AFC7DF0> <__main__.CPU object at 0x000002221AFC7FD0> <__main__.Disk object at 0x000002221AFC7EE0>

 

 

 

# (3)类的深拷贝 deepcopy  源对象和子对象都拷贝
print('----------------------------------')
computer3 = copy.deepcopy(computer)
print(computer,computer.cpu,computer.disk) # <__main__.Computer object at 0x000002043D317EB0> <__main__.CPU object at 0x000002043D317FD0> <__main__.Disk object at 0x000002043D317EE0>
print(computer3,computer3.cpu,computer3.disk)  # <__main__.Computer object at 0x000002043D3179A0> <__main__.CPU object at 0x000002043D3159C0> <__main__.Disk object at 0x000002043D315900>