Python - Group Sublists by another List Last Updated : 20 Feb, 2023 Comments Improve Suggest changes 1 Likes Like Report Sometimes, while working with lists, we can have a problem in which we need to group all the sublists, separated by elements present in different list. This type of custom grouping is uncommon utility but having solution to these can always be handy. Lets discuss certain way in which this task can be performed. Method #1 : Using loop + generator(yield) This is brute force way in which this task can be performed. In this, we iterate the list and make groups dynamically using yield. We keep track of elements occurred and restart list when we find element in second list. Python3 # Python3 code to demonstrate # Group Sublists by another List # using loop + generator(yield) # helper function def grp_ele(test_list1, test_list2): temp = [] for i in test_list1: if i in test_list2: if temp: yield temp temp = [] yield i else: temp.append(i) if temp: yield temp # Initializing lists test_list1 = [8, 5, 9, 11, 3, 7] test_list2 = [9, 11] # printing original lists print("The original list 1 is : " + str(test_list1)) print("The original list 2 is : " + str(test_list2)) # Group Sublists by another List # using loop + generator(yield) res = list(grp_ele(test_list1, test_list2)) # printing result print ("The Grouped list is : " + str(res)) Output : The original list 1 is : [8, 5, 9, 11, 3, 7] The original list 2 is : [9, 11] The Grouped list is : [[8, 5], 9, 11, [3, 7]] Time Complexity: O(n*n)Auxiliary Space: O(n) Create Quiz Comment M manjeet_04 Follow 1 Improve M manjeet_04 Follow 1 Improve Article Tags : Python Python Programs Python list-programs Python-list-of-lists Explore Python FundamentalsPython Introduction 2 min read Input and Output in Python 4 min read Python Variables 4 min read Python Operators 4 min read Python Keywords 2 min read Python Data Types 8 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 5 min read Python Functions 5 min read Recursion in Python 4 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 4 min read Python Tuples 4 min read Python Dictionary 3 min read Python Sets 6 min read Python Arrays 7 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 5 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 3 min read Python MySQL 9 min read Python Packages 10 min read Python Modules 3 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 3 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 4 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 3 min read StatsModel Library - Tutorial 3 min read Learning Model Building in Scikit-learn 6 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 6 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 7 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 5 min read Build a REST API using Flask - Python 3 min read Building a Simple API with Django REST Framework 3 min read Python PracticePython Quiz 1 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like