Python | Split nested list into two lists

Given a nested 2D list, the task is to split the nested list into two lists such that first list contains first elements of each sublists and second list contains second element of each sublists.

Method #1: Using map, zip()

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python code to demonstrate
# splitting nested list
# into 2 lists
  
# initialising nested lists
ini_list = [[1, 2], [4, 3], [45, 65], [223, 2]]
  
# printing initial lists
print ("initial list", str(ini_list))
  
# code to split it into 2 lists
res1, res2 = map(list, zip(*ini_list))
  
# printing result
print("final lists", res1, "\n", res2)

chevron_right


Output:



initial list [[1, 2], [4, 3], [45, 65], [223, 2]]
final lists [1, 4, 45, 223] 
 [2, 3, 65, 2]

 
Method #2: Using list comprehension

filter_none

edit
close

play_arrow

link
brightness_4
code

# python code to demonstrate
# splitting nested list
# into 2 lists
  
# initialising nested lists
ini_list = [[1, 2], [4, 3], [45, 65], [223, 2]]
  
# printing initial lists
print ("initial list", str(ini_list))
  
# code to split it into 2 lists
res1 = [i[1] for i in ini_list]
res2 = [i[0] for i in ini_list]
  
# printing result
print("final lists", str(res1), "\n", str(res2))

chevron_right


Output:

initial list [[1, 2], [4, 3], [45, 65], [223, 2]]
final lists [2, 3, 65, 2] 
 [1, 4, 45, 223]

 
Method #3: Using operator.itemgetter()

filter_none

edit
close

play_arrow

link
brightness_4
code

# python code to demonstrate
# splitting nested list
# into 2 lists
  
from operator import itemgetter
  
# initialising nested lists
ini_list = [[1, 2], [4, 3], [45, 65], [223, 2]]
  
# printing initial lists
print ("initial list", str(ini_list))
  
# code to split it into 2 lists
res1 = list(map(itemgetter(0), ini_list))
res2 = list(map(itemgetter(1), ini_list))
  
# printing result
print("final lists", str(res1), "\n", str(res2))

chevron_right


Output:

initial list [[1, 2], [4, 3], [45, 65], [223, 2]]
final lists [1, 4, 45, 223] 
 [2, 3, 65, 2]


My Personal Notes arrow_drop_up

Programming freaktech Enthusiast and have interest in learning new upcoming technologies

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.