python中的深copy和淺copy

深淺copy相似於linux的硬軟連接，一個複製爲另外一個文件，一個相似於快捷方式。

import copy

#這裏有子對象
numbers=['1','2','3',['4','5']]
#淺copy
num1=copy.copy(numbers)
#深copy
num2=copy.deepcopy(numbers)

#直接對對象內容進行修改
num1.append('6')

#這裏能夠看到內容地址發生了偏移，增長了偏移‘6’的地址
print('numbers:',numbers)
print('numbers memory address:',id(numbers))
print('numbers[3] memory address',id(numbers[3]))
print('num1:',num1)
print('num1 memory address:',id(num1))
print('num1[3] memory address',id(num1[3]))

num1[3].append('6')

print('numbers:',numbers)
print('num1:',num1)
print('num2',num2)

輸出：
numbers: ['1', '2', '3', ['4', '5']]
numbers memory address: 1556526434888
numbers memory address 1556526434952
num1: ['1', '2', '3', ['4', '5'], '6']
num1 memory address: 1556526454728
num1[3] memory address 1556526434952
numbers: ['1', '2', '3', ['4', '5', '6']]
num1: ['1', '2', '3', ['4', '5', '6'], '6']
num2 ['1', '2', '3', ['4', '5']]