深浅拷贝

每日总结

复制运算

l1=[1,2,3]
l2=l1
l1.append(4)
print(l2)

dic = {'name':'aid'}
dic1 = dic
dic['age'] = 18
print(dic)
print(dic1)

s= 'aid'
s1 = s
s2 = s.replace('a','b')
print(s)
print(s1)
print(s2)

copy()

l1 = [1,2,3,4]
l2 = l1.copy()
l1.append('aid')
print(l1,id(l1))  
print(l2,id(l2)) 

l1 = [1,[22,33,44],3,4,]
l2 = l1.copy()
l1[1].append('55')
print(l1,id(l1),id(l1[1]))
print(l2,id(l2),id(l2[1]))
# 第一层都是独立的的。从第二层开始都是是公用的，改一个都会变。

copy.deepcopy()

import copy  # 先引入模块
l1 = [1,[22,33,44],3,4,]
l2 = copy.deepcopy(l1)
print(id(l1))
print(id(l2))
# 改变第一层
l1[0] = 111
print(l1)  # [111, [22, 33, 44], 3, 4]
print(l2)  # [1, [22, 33, 44], 3, 4]
# 改变第二层
l1[1].append('aid')
print(l1)  # [111, [22, 33, 44, 'aid'], 3, 4]
print(l2)  # [1, [22, 33, 44], 3, 4]
a=[1,2,3]
b=a
a=[4,5,6]
print(a)
print(b)
def addd(x):
    x.append(1)
    print(id(x))
    x = x + [1]
    print(id(x))
    #x.append(1)
    #print(id(x))