Python中的copy()函数详解(list,array)

>>> list1=[1,2,3,4,5,6]
>>> list2=list1
>>> list1[2]=88
>>> list1
[1, 2, 88, 4, 5, 6]
>>> list2
[1, 2, 88, 4, 5, 6]

array5 = array1.copy() # 对原始的array1的复制
array6 = array[1:4].copy() # 对切片array[1:4]的复制

dict.copy() ->该函数无参数，返回一个一模一样的内存地址不同的字典
In [33]: old_dict = {'name' : 'insane' , 'age' : 33}
In [34]: new_dict = ld_dict.copy()
In [35]: id(new_dict) != id(old_dict)
Out[35]: True

# coding:utf-8
fruits = {
    'apple': 30,
    'banana': 50,
    'pear': 100
}
real_fruits = fruits.copy()
print(real_fruits)
real_fruits['orange'] = 50
real_fruits.update({'cherry': 100})
print(real_fruits)
print('原始fruits：', fruits)
real_fruits['apple'] = real_fruits['apple'] - 5
print(real_fruits)
real_fruits['pear'] -= 3
print(real_fruits)
real_fruits.clear()
print(real_fruits)
print('第二天。。。')
real_fruits = fruits.copy()
print(real_fruits)

{'apple': 30, 'banana': 50, 'pear': 100}
{'apple': 30, 'banana': 50, 'pear': 100, 'orange': 50, 'cherry': 100}
原始fruits： {'apple': 30, 'banana': 50, 'pear': 100}
{'apple': 25, 'banana': 50, 'pear': 100, 'orange': 50, 'cherry': 100}
{'apple': 25, 'banana': 50, 'pear': 97, 'orange': 50, 'cherry': 100}
{}
第二天。。。
{'apple': 30, 'banana': 50, 'pear': 100}
Process finished with exit code 0