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Python | Check if a nested list is a subset of another nested list Given two lists list1 and list2, check if list2 is a subset of list1 and return True or False accordingly. Examples: Input : list1 = [[2, 3, 1], [4, 5], [6, 8]] list2 = [[4, 5], [6, 8]] Output : True Input : list1 = [['a', 'b'], ['e'], ['c', 'd']] list2 = [['g']] Output : False Let's discuss few approaches to solve the problem. Approach #1 : Naive 7 min read Python | Pair and combine nested list to tuple list Sometimes we need to convert between the data types, primarily due to the reason of feeding them to some function or output. This article solves a very particular problem of pairing like indices in list of lists and then construction of list of tuples of those pairs. Let's discuss how to achieve the solution of this problem. Method #1 : Using zip() 10 min read Python | Find maximum length sub-list in a nested list Given a list of lists, write a Python program to find the list with maximum length. The output should be in the form (list, list_length). Examples: Input : [['A'], ['A', 'B'], ['A', 'B', 'C']] Output : (['A', 'B', 'C'], 3) Input : [[1, 2, 3, 9, 4], [5], [3, 8], [2]] Output : ([1, 2, 3, 9, 4], 5) Let's discuss different approaches to solve this prob 3 min read Python | Convert string List to Nested Character List Sometimes, while working with Python, we can have a problem in which we need to perform interconversion of data. In this article we discuss converting String list to Nested Character list split by comma. Let's discuss certain ways in which this task can be performed. Method #1 : Using list comprehension + split() The combination of above functional 7 min read Python - Convert List to custom overlapping nested list Given a list, the task is to write a Python program to convert it into a custom overlapping nested list based on element size and overlap step. Examples: Input: test_list = [3, 5, 6, 7, 3, 9, 1, 10], step, size = 2, 4Output: [[3, 5, 6, 7], [6, 7, 3, 9], [3, 9, 1, 10], [1, 10]]Explanation: Rows sliced for size 4, and overcoming started after 2 eleme 3 min read Python - Create nested list containing values as the count of list items Given a list, the task is to write a Python program to create a nested list where the values are the count of list items. Examples: Input: [1, 2, 3] Output: [[1], [2, 2], [3, 3, 3]] Input: [4, 5] Output: [[1, 1, 1, 1], [2, 2, 2, 2, 2]] Method 1: Using nested list comprehension The list will contain the count of the list items for each element e in 2 min read Python program to Flatten Nested List to Tuple List Given a list of tuples with each tuple wrapped around multiple lists, our task is to write a Python program to flatten the container to a list of tuples. Input : test_list = [[[(4, 6)]], [[[(7, 4)]]], [[[[(10, 3)]]]]]Output : [(4, 6), (7, 4), (10, 3)]Explanation : The surrounded lists are omitted around each tuple. Input : test_list = [[[(4, 6)]], 7 min read Python | Convert given list into nested list Sometimes, we come across data that is in string format in a list and it is required to convert it into a list of the list. This kind of problem of converting a list of strings to a nested list is quite common in web development. Let's discuss certain ways in which this can be performed. Convert the Given List into Nested List in PythonBelow are th 5 min read Python - Test for empty Nested Records Sometimes, while working with Python dictionaries, we can have a problem in which we need to test if a particular dictionary has nested records, and all of them is empty, i.e with no key or no value in case of list. This kind of problem is quite common in data domains such as Data Science. Let's discuss certain way in which this task can be perform 6 min read Python | Intersection of two nested list This particular article aims at achieving the task of intersecting two list, in which each element is in itself a list. This is also a useful utility as this kind of task can come in life of programmer if he is in the world of development. Lets discuss some ways to achieve this task. Method 1: Naive Method This is the simplest method to achieve thi 5 min read Python | Remove all duplicates and permutations in nested list Given a nested list, the task is to remove all duplicates and permutations in that nested list. Input: [[-11, 0, 11], [-11, 11, 0], [-11, 0, 11], [-11, 2, -11], [-11, 2, -11], [-11, -11, 2]] Output: {(-11, 0, 11), (-11, -11, 2)} Input: [[-1, 5, 3], [3, 5, 0], [-1, 5, 3], [1, 3, 5], [-1, 3, 5], [5, -1, 3]] Output: {(1, 3, 5), (0, 3, 5), (-1, 3, 5)} 4 min read Python | Find the sublist with maximum value in given nested list Given a list of list, the task is to find sublist with the maximum value in second column. Examples: Input : [['Paras', 90], ['Jain', 32], ['Geeks', 120], ['for', 338], ['Labs', 532]] Output :['Labs', 532] Input: [['Geek', 90], ['For', 32], ['Geeks', 120]] Output: ['Geeks', 120] Below are some tasks to achieve the above task. Method #1: Using lambd 4 min read Python | Remove duplicates from nested list The task of removing duplicates many times in the recent past, but sometimes when we deal with the complex data structure, in those cases we need different techniques to handle this type of problem. Let's discuss certain ways in which this task can be achieved. Method #1 : Using sorted() + set() This particular problem can be solved using the above 5 min read Python | Remove all occurrences in nested list The task of removing an element generally doesn't pose any challenge, but sometimes, we may have a more complex problem than just removing a single element or performing removal in just a normal list. The problem can be removing all occurrences of the nested list. Let's discuss certain ways in which this problem can be solved. Method #1: Using list 5 min read Python | Column wise sum of nested list Given a nested list (where sublists are of equal length), write a Python program to find the column-wise sum of the given list and return it in a new list. Examples: Input : [[1, 5, 3], [2, 7, 8], [4, 6, 9]] Output : [7, 18, 20] Input : [[20, 5], [2, 54], [45, 9], [72, 3]] Output : [139, 71] Method #1: C/C++ Code # Python3 program to Column wise su 3 min read python | Nested List Intersection Matrix Product The problem of finding the common elements in list of 2 lists is quite a common problem and can be dealt with ease and also has been discussed before many times. But sometimes, we require to find the elements that are in common from N lists and return their product. Let’s discuss certain ways in which this operation can be performed. Method #1 : Us 3 min read Python - Value nested grouping on List Sometimes, while working with data, we can have a problem in which we have flat data in the form of a list of dictionaries, and we need to perform the categorization from that bare dictionaries according to ids. This can have applications in domains that involve data, such as web development and Data Science. Let's discuss the certain way in which 6 min read Python - Inner Nested Value List Mean in Dictionary Sometimes, while working with Python Dictionaries, we can have a problem in which we need to extract the mean of nested value lists in dictionary. This problem can have application in many domains including web development and competitive programming. Lets discuss certain ways in which this task can be performed. Method #1 : Using mean() + loop The 5 min read Python - Unnest single Key Nested Dictionary List Sometimes, while working with Python data, we can have a problem in which we need to perform unnesting of all the dictionaries which have single nesting of keys, i.e a single key and value and can easily be pointed to outer key directly. This kind of problem is common in domains requiring data optimization. Let's discuss certain ways in which this 7 min read Python - Type conversion in Nested and Mixed List While working with Python lists, due to its heterogeneous nature, we can have a problem in which we need to convert the data type of each nested element of list to a particular type. In mixed list, this becomes complex. Let's discuss the certain ways in which this task can be performed. Input : test_list = [('7', ['8', ('5', )])] Output : [(7, [8, 7 min read Python - Convert Dictionaries List to Order Key Nested dictionaries Given list of dictionaries, convert to ordered key dictionary with each key contained dictionary as its nested value. Input : test_list = [{"Gfg" : 3, 4 : 9}, {"is": 8, "Good" : 2}] Output : {0: {'Gfg': 3, 4: 9}, 1: {'is': 8, 'Good': 2}} Explanation : List converted to dictionary with index keys. Input : test_list = [{"is": 8, "Good" : 2}] Output : 6 min read Python - Create Nested Dictionary using given List Given a list and dictionary, map each element of list with each item of dictionary, forming nested dictionary as value. Input : test_dict = {'Gfg' : 4, 'best' : 9}, test_list = [8, 2] Output : {8: {'Gfg': 4}, 2: {'best': 9}} Explanation : Index-wise key-value pairing from list [8] to dict {'Gfg' : 4} and so on. Input : test_dict = {'Gfg' : 4}, test 3 min read Python - K list Nested Dictionary Mesh Given 2 lists, create nested mesh with constant List. Input : test_list1 = [4, 6], test_list2 = [2, 7], K = [] Output : {4: {2: [], 7: []}, 6: {2: [], 7: []}} Explanation : Nested dictionary initialized with []. Input : test_list1 = [4], test_list2 = [2], K = [1] Output : {4: {2: [1]}} Explanation : Nested dictionary initialized with [1]. Method : 2 min read Python Program to Find the Total Sum of a Nested List Using Recursion A nested list is given. The task is to print the sum of this list using recursion. A nested list is a list whose elements can also be a list. Examples : Input: [1,2,[3]] Output: 6 Input: [[4,5],[7,8,[20]],100] Output: 144 Input: [[1,2,3],[4,[5,6]],7] Output: 28 Recursion: In recursion, a function calls itself repeatedly. This technique is generally 5 min read How to iterate through a nested List in Python? In this article, we are going to see how to iterate through a nested List. A list can be used to store multiple Data types such as Integers, Strings, Objects, and also another List within itself. This sub-list which is within the list is what is commonly known as the Nested List. Iterating through a Nested List Lets us see how a typical nested list 2 min read Python Program to Flatten a Nested List using Recursion Given a nested list, the task is to write a python program to flatten a nested list using recursion. Examples: Input: [[8, 9], [10, 11, 'geeks'], [13]] Output: [8, 9, 10, 11, 'geeks', 13] Input: [['A', 'B', 'C'], ['D', 'E', 'F']] Output: ['A', 'B', 'C', 'D', 'E', 'F'] Step-by-step Approach: Firstly, we try to initialize a variable into the linked l 3 min read Python | How to copy a nested list Copying a nested list in Python involves preserving both the structure and values of the original. One common method is using copy.deepcopy() from the copy module. Additionally, list comprehensions with slicing offer a concise approach for creating an independent duplicate. In the previous article, we have seen how to clone or Copy a list, now let' 4 min read 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 the first list contains the first elements of each sublist and the second list contains the second element of each sublist. In this article, we will see how to split nested lists into two lists in Python. Python Split Nested List into Two ListsBelow are the ways b 5 min read Python - Nested List to single value Tuple Sometimes, while working with Python data, we can have problems in which we need to convert Python Nested lists to single values tuples. This kind of problem can have applications in domains such as web development and competitive programming. Let's discuss certain ways in which this task can be performed. Example: Input : test_list = [[5, 6], [4, 7 min read Python | Convert list of nested dictionary into Pandas dataframe Given a list of the nested dictionary, write a Python program to create a Pandas dataframe using it. We can convert list of nested dictionary into Pandas DataFrame. Let's understand the stepwise procedure to create a Pandas Dataframe using the list of nested dictionary. Convert Nested List of Dictionary into Pandas DataframeBelow are the methods th 4 min read