深层复制是递归发生复制过程的过程。这意味着首先构造一个新的集合对象，然后用原始中找到的子对象的副本递归填充它。如果是深层复制，则会将对象的副本复制到其他对象中。这意味着对对象副本所做的任何更改都不会反映在原始对象中。在python中，这是使用“deepcopy（）”函数实现的。

# Python code to demonstrate copy operations

# importing "copy" for copy operations

import copy

# initializing list 1

li1 = [1, 2, [3,5], 4]

# using deepcopy to deep copy

li2 = copy.deepcopy(li1)

# original elements of list

print ("The original elements before deep copying")

for i in range(0,len(li1)):

print (li1[i],end=" ")

print("\r")

# adding and element to new list

li2[2][0] = 7

# Change is reflected in l2

print ("The new list of elements after deep copying ")

for i in range(0,len( li1)):

print (li2[i],end=" ")

print("\r")

# Change is NOT reflected in original list

# as it is a deep copy

print ("The original elements after deep copying")

for i in range(0,len( li1)):

print (li1[i],end=" ")