w3resource

Python: Pack consecutive duplicates of a given list elements into sublists

Python List: Exercise - 74 with Solution

Write a Python program to pack consecutive duplicates of a given list of elements into sublists.

Sample Solution:

Python Code:

from itertools import groupby
def pack_consecutive_duplicates(l_nums):
    return [list(group) for key, group in groupby(l_nums)]
n_list = [0, 0, 1, 2, 3, 4, 4, 5, 6, 6, 6, 7, 8, 9, 4, 4 ]
print("Original list:") 
print(n_list)
print("\nAfter packing consecutive duplicates of the said list elements into sublists:")
print(pack_consecutive_duplicates(n_list))

Sample Output: 

Original list:
[0, 0, 1, 2, 3, 4, 4, 5, 6, 6, 6, 7, 8, 9, 4, 4]

After packing consecutive duplicates of the said list elements into sublists:
[[0, 0], [1], [2], [3], [4, 4], [5], [6, 6, 6], [7], [8], [9], [4, 4]]

Flowchart:

Flowchart: Pack consecutive duplicates of a given list elements into sublists.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Python program to remove consecutive duplicates of a given list.
Next: Write a Python program to create a list reflecting the run-length encoding from a given list of integers or a given list of characters.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Follow us on Facebook and Twitter for latest update.

Python: Tips of the Day

Creates a list of elements, grouped based on the position in the original lists:

Example:

def tips_zip(*args, fill_value=None):
  	max_length = max([len(lst) for lst in args])
 	 result = []
  	for i in range(max_length):
   	 result.append([
      args[k][i] if i < len(args[k]) else fillvalue for k in range(len(args))
   	 ])
 	 return result
print(tips_zip(['a', 'b'], [1, 2], [True, False]))
print(tips_zip(['a'], [1, 2], [True, False]))
print(tips_zip(['a'], [1, 2], [True, False], fill_value = '1'))

Output:

[['a', 1, True], ['b', 2, False]]
[['a', 1, True], [None, 2, False]]
[['a', 1, True], ['1', 2, False]]