Python|如何复制嵌套列表

在上一篇文章中，我们已经了解了如何克隆或复制列表，现在让我们看看如何在Python中复制嵌套列表。

方法#1：使用迭代

# Python program to copy a nested list
  
# List initialization
Input_list = [[0, 1, 2], [3, 4, 5], ]
Output = [] 
  
# Using iteration to assign values
for x in range(len(Input_list)):
    temp = []
    for elem in Input_list[x]:
        temp.append(elem)
    Output.append(temp)
  
# Printing Output
print("Initial list is:")
print(Input_list)
print("New assigned list is")
print(Output)

输出：

Initial list is:
[[0, 1, 2], [3, 4, 5]]
New assigned list is
[[0, 1, 2], [3, 4, 5]]

方法 #2：使用 deepcopy

# Python program to copy a nested list
import copy
  
# List initialization
Input = [[1, 0, 1], [1, 0, 1]]
  
# using deepcopy
Output = copy.deepcopy(Input)
  
# Printing
print("Initial list is:")
print(Input)
print("New assigned list is")
print(Output)

输出：

Initial list is:
[[1, 0, 1], [1, 0, 1]]
New assigned list is
[[1, 0, 1], [1, 0, 1]]

方法#3：使用列表理解和切片

# Python program to copy a nested list
  
# List initialization
Input_list = [[0,1,2], [3,4,5], [0, 1, 8]]
  
# comprehensive method
out_list = [ele[:] for ele in Input_list]
  
# Printing Output
print("Initial list is:")
print(Input_list)
print("New assigned list is")
print(out_list)

输出：

Initial list is:
[[0, 1, 2], [3, 4, 5], [0, 1, 8]]
New assigned list is
[[0, 1, 2], [3, 4, 5], [0, 1, 8]]