Set is one of 4 built-in data types in Python used to store collections of data, the other 3 are List, Tuple, and Dictionary, all with different qualities and usage. The join() method accepts iterables as a parameter, such as Lists, Tuples, String, etc.Further, it returns a new string that contains the elements concatenated from the iterable as an argument. The statistics.mean() function is used to calculate the mean/average of input values or data set.. s = set(): initialisation d'un set avec aucun élément. For example, if you have a list of tests scores defined as "scores=[14, 20, 13, 20, 15]," the list tells you every value, but if you convert it into a set, it removes the duplicate and leaves {14, 20, 13, 15}. As Set does not allow duplicates, when you convert list to set, all duplicates will be removed in the set. It is represented as a collection of data points in square brackets. The mean() function accepts the list, tuple or data-set containing numeric values as a parameter and returns the average of the data-items. Sets are written with curly brackets. pas d'indice).On accède aux valeurs d'un dictionnaire par des clés. Sets are written with curly brackets. Extend the list by appending all the items from the iterable. They allow you to express complicated looping logic in a tiny amount of space. The intersection operation creates a … This property of set can be used to get unique values from a list in Python. There is no index attached to any element in a python set. 1. The list () function takes an iterable as an argument and converts that into a List type object. Another difference is that square brackets are used for lists, while curly brackets are used for sets. A set is initiated with curly brackets instead of square brackets. A set is a unique collection of unordered elements. We’ve listed a few here. So the full code is: big_set={1, 3, 4, 5, 7, 8, 9, 11, 12, 14, 15, 17}. We’ll go over simple methods that will allow the conversion of a python set object to a list object quickly. This means you need a set to start with, which you can define easily by picking a variable such as "big_set" and then adding the contents, separated by commas and in curly brackets. Creating a list is as simple as putting different comma-separated values between square brackets. Note that if you convert a list to a set and then back again, you lose any repeated values in the first conversion, and they don't come back. 1. In this tutorial, we will learn to use list() in detail with the help of examples. Creating Python Sets A set is created by placing all the items (elements) inside curly braces {}, separated by comma, or by using the built-in set () function. It's calling a version of mergesort on the list. The elements of a list can be anything, such a numbers (int), strings (str), and even other lists. You probably also noticed that the syntax for creating a set is different than for lists. This is because sets are unordered. It calls the function __cmp__ on each object when comparing values, and decides which one to put in front of the other based on the value returned from __cmp__.The return value is 0 for equal to, 1 for greater than, and -1 for less than the compared value. We can also use the NumPy module for creating NumPy array and apply array operation on it. Now, we will […], In this post, we will see how to remove the first element from a list in python. This is a built-in method ready for you to use. Python Set Operations : In this tutorial, we will learn about different python set operations, some of them are as follows : Set Contains; Set Not Contains; Set Length; Set Deletion; Set Min & Max; Set Contains. 2. Python Set Operations. We’ve listed a few here. 6 min read. [crayon-5ffba8c96ed22400415908/] Output: Average of listOfIntegers: 3.0 Using reduce(), […], In this post, we will see how to create a list of lists in python. Using sets gives you also easy way to find the difference or the same elements of two and more lists. Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage. List – List in Python is collecting any number of different items in the order and mutable.The list is created by placing all its elements inside square brackets[], separated by a comma. Syntax : set (iterable) Parameters : Any iterable sequence like list, tuple or dictionary. This case doesn't give the list a name, so it only returns the list. A list consists of zero or more other elements in a fixed order. Well, we know that Python set is the unordered collection of unique items. We can create one empty list and append multiple class objects to this list. It may consist of various elements; the order of elements in a set is undefined. Sets can be used to carry out mathematical set operations like union, intersection, difference and symmetric difference. Below is a list of the set operations available in Python. The simplest one is to use the index operator ([ ]) to access an element from the list. The most important difference between a list and a set in Python is that a list can contain duplicate elements, while a set only contains unique elements. It is like an array in other programming languages. Set Operations. Also, we can have an element with equal value more than once (which is not possible in sets) and is backed by many different methods, which makes our life a lot easier. Typecasting to list can be done by simply using list(set_name). List. Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage. my_set = set( {1, 4, 3, 5}) In this Python Beginner Tutorial, we will begin learning about Lists, Tuples, and Sets in Python. It is quite easy to create list of lists in Python. Python list can hold a list of class objects. If a element is present in the set then return True otherwise return False. Each list element will be an object and we can access any member of that object like method, variables etc. numbers = [1, 2, 2, 3, 3, 4, 5] def get_unique_numbers(numbers): list_of_unique_numbers = [] unique_numbers = set(numbers) for number in unique_numbers: list_of_unique_numbers.append(number) return list_of_unique_numbers print(get_unique_numbers(numbers)) # result: [1, 2, 3, 4, 5] Learn about how to Matrix multiplication in Python using user input. For example − Similar to string indices, list indices start at 0, and lists can be sliced, concatenated and so on. Operator in can be used to check, if a given element is present in the set or not. Python has four built-in iterable types: list, dict, tuple, and set. Get quality tutorials to your inbox. Python Set seems to be the most obvious choice to identify the common as well as the difference of two lists. First, you define the list in a way that makes sense for the information contained in it. Tuple is an immutable object; therefore, it can be added to a set. How to Convert a List Into a Set in Python, Geeks for Geeks: Python: Convert Set Into a List. To convert Python set to list data type, use the list() method. Typecasting to list can be done … Add a list to set using add () & union () In python, set class provides a function to add the contents of two sets i.e. So they do not support any indexing or slicing operation. Python List to Set Time Complexity The time complexity of converting a list to a set is linear in the number of list elements. (Read more on the Ultimate Guide to Python Sets). A set is a collection which is both unordered and unindexed. What happens when we try to create Python sets from lists or tuples containing duplicate elements? Whereas list in python is a mutable object, so we cannot add a list to the python using add () function. The set() builtin creates a Python set from the given iterable. It's calling a version of mergesort on the list. To convert this into a list, you define a variable (say, "big_list") and use the list() command, so you type something like big_list=list(big_set) and then print(big_list) to display the result. Initially, we will need to convert the input list to set using the set() function. Python provides a magical join() method that takes a sequence and converts it to a string. Et de bénéficier en plus d’une implémentation du type set en C et non plus en Python, avec la belle augmentation de performance qui va avec. List […] We can do this with operators or methods. What is Python doing behind the scenes? Important thing about a list is that items in a list need not be of the same type. Returns : An empty set if no element is passed. The list is a most versatile datatype available in Python which can be written as a list of comma-separated values (items) between square brackets. Python set to list. names=['Lee', 'Mike','Jamie','Mike','Sarah']. Python Set Operations : In this tutorial, we will learn about different python set operations, some of them are as follows : Set Contains; Set Not Contains; Set Length; Set Deletion; Set Min & Max; Set Contains. You’ll find many ways of accessing or indexing the elements of a Python list. Here is the quick example of the same. A set is an unordered collection with no duplicate elements. Different elements from the same list can have different types. Collection: A set is a collection of elements like a list or a tuple.The collection consists of either primitive elements (e.g. The principle outlined above generally applies: where a set is expected, methods will typically accept any iterable as an argument, but operators require actual sets as operands. To intialize a set with values, you can pass in a list to set(). Index Method # Define a list z = [4, 1, 5, 4, 10, 4] The index method returns the first index at which a value occurs. Introduction to Python Data Structures. Creating a set. If you try to pass a list object to the add () function, then it will give error. Besides that, you can check if an element belongs to a set. Given a set, write a Python program to convert the given set into list. If a element is present in the set then return True otherwise return False. En Python, les ensembles sont définis par le mot "set()" depuis Python 2.3, d'abord en important le module du même nom, puis depuis nativement Python 2.6, avec "frozenset()". List indexing. You can add and delete elements of a set, you can iterate the elements of the set, you can perform standard operations on sets (union, intersection, difference). L’intégration des sets mutables (les plus utiles) dans le core du langage Python, au même niveau que les tuples, les listes et les dictionnaires, se heurtait encore à une limitation syntaxique : il fallait écrire set([1, 2, 3]). Set is one of 4 built-in data types in Python used to store collections of data, the other 3 are List, Tuple, and Dictionary, all with different qualities and usage. Python lists have different methods that help you modify a list. Lists and sets in Python both contain groups of items, but there are important differences between the two. In this case, "Unique names:" has been added to the output for presentation purposes. En effet, il n� Un ensemble ne peut pas contenir de doublon : on ne peut y trouver des éléments … The set data structure is one of the basic collection data types in Python and many other programming languages.. A set is an unordered collection of unique elements. It has various use cases in Python as it is mutable, can contain values of any other data type in the same list. Output: List Of Fruits are: [‘Orange’, ‘Apple’, ‘Grapes’, ‘Mango’] List Of Fruits after removing first element: [‘Apple’, ‘Grapes’, ‘Mango’] Removed Fruit: Orange pop […], There are multiple ways to find the average of the list in Python. A set is a collection which is both unordered and unindexed. To convert list to set in Python, use the set() function. Some are performed by operator, some by method, and some by both. The simplest one is to use the index operator ([ ]) to access an element from the list. Un set est un ensemble de clefs non ordonnées et non redondant où l'on peut savoir si un élément est présent sans avoir à parcourir toute la liste (une sorte de dictionnaire où les valeurs seraient ignorées, seules les clefs comptent). Use list() method; Using sorted() method; Using [*set, ] Use list() method. list: an ordered, mutable collection of elements. Sets are used to store multiple items in a single variable. So, we are going to explore it first and then will use nested loops and list comprehension. To convert set to list in Python, use the list() method. This section of the tutorial just goes over various python list methods. 13.1 Dictionnaires 13.1.1 Définition. The set() function in Python is an inbuilt function that creates a set. To convert this list into a set, you use the command set(), where you put the name of the list you want to convert between the parentheses. Different elements from the same list can have different types. Python has four built-in iterable types: list, dict, tuple, and set. If you deal with huge lists or the performance is important for you then you can use set in order to speed up your applications. Home > Python > Python List > Python Convert list to set. As we know that, Python didn’t have an in-built array data type, so we try to use list data type as an array. To intialize a set with values, you can pass in a list to set(). The intersection operation creates a … Well, we know that Python set is the unordered collection of unique items. Compare two lists in Python 3 with sets. You can easily convert from a list to a set like this: fruit_list = ['Apple', 'Banana', 'Apple', 'Orange'] fruit_set = set(fruit_list) print(fruit_set) #-> {'Orange', 'Banana', 'Apple'} Great! Convert Python List to Set. For many reasons, you might need to convert a list to a set in Python, and there is a simple function you can use to do this. You can convert a Python set to a list or vice versa by defining the starting set or list and then using either the "list( )" or "set( )" commands, with the appropriate name in the parentheses. Un ensemble est une collection non ordonnée d'objets, contrairement aux séquences comme les listes et les tuples dans lesquels chaque élément est indexé. The elements of a list can be anything, such a numbers (int), strings (str), and even other lists. Un ensemble ne peut pas contenir de doublon : on ne peut y trouver des éléments que zéro ou une fois. Methods to Convert a Set to List in Python. Important thing about a list is that items in a list need not be of the same type. To intersect multiple sets, stored in a list l, use the Python one-liner l.pop().intersection(*l) that takes the first set from the list, calls the intersection() method on it, and passes the remaining sets as arguments by unpacking them from the list. One of the most important data structures used in Python is a list. In the first example of this article, we have used list items as keys and value as an integer of the dictionary. Convert List items as values in the dictionary with indexed keys in Python. Un ensemble est une collection non ordonnée d'objets, contrairement aux séquences comme les listes et les tuples dans lesquels chaque élément est indexé. Python Data Structures – Lists, Tuples, Sets, Dictionaries. The first argument is the index of the element before which to insert, so a.insert(0, x) inserts at the front of the list, and a.insert(len(a), x) is equivalent to a.append(x). In this tutorial, you can quickly discover the most efficient methods to convert Python List to String. You’ll find many ways of accessing or indexing the elements of a Python list. s = set(): initialisation d'un set avec aucun élément. Nothing unusual happens when we create Python sets from lists or tuples containing unique elements. Lists are mutable which is one of the reasons why they are so commonly used. Note that sets don't have duplicates. Nothing unusual happens when we create Python sets from lists or tuples containing unique elements. Python mean() function. List indexing. 1. Tous les membres d'un ensemble doivent être hachable, comme les clés des dictionna… Here is simple example to create list of lists in Python. So, let’s start Python Data Structure. Python join() method can be used to convert a List to String in Python. En Python, les ensembles sont définis par le mot "set()" depuis Python 2.3, d'abord en important le module du même nom, puis depuis nativement Python 2.6, avec "frozenset()". It's important to remember that you can use strings, integers, floats or other objects as part of a set or a list, and these can also be mixed in the same set or list. This is a built-in method ready for you to use. Set. The sets in python are typically used for mathematical operations like union, intersection, difference and complement etc. [Fixed] no module named ‘sklearn.cross_validation’, Matrix multiplication in Python using user input, Remove all instances of element from list in Python, Python | Introduction and Installation of OpenCv. It is commonly used to construct list, set or dictionary objects which are known as list comprehension, set comprehension and dictionary comprehension. Using list() Function. As you can see, set starts with open curly braces and ends with close with braces. One of the most important data structures used in Python is a list. Using lambda function, sort(), set() method to check if two lists are equal and have same elements. In this article we will discuss different ways to convert a single or multiple lists to dictionary in Python. Set objects also support mathematical operations like union, intersection, difference, and symmetric difference. You could write big_set={1, 3, 4, 5, 7, 8, 9, 11, 12, 14, 15, 17} to define a set of integers or any other values. Note that you can append different class objects to the same list. Things are complicated a little by the fact that a Python dictionary also uses curly brackets, but there each item consists of the value itself and a "key" separated by a colon. In this tutorial, we will learn about set() in detail with the help of examples. Equivalent to a[len(a):] = iterable. Set : s = set(['a', 'b', 'c']): définition d'un set. Save my name, email, and website in this browser for the next time I comment. You can also run the same conversion in the opposite direction, and the process is basically the same, except you use the list() command on a set rather than the other way around. In this example, we will see how to convert Python set to list using different approaches. How to compare two lists in Python? Initially, we will need to … Subscribe now. In the code below, it will return 0. print(z.index(4)) You can also specify where you start your search. The list can contain any of the following object types: Strings, Characters, Numbers. dataScientist = set(['Python', 'R', 'SQL', 'Git', 'Tableau', 'SAS']) dataEngineer = set(['Python', 'Java', 'Scala', 'Git', 'SQL', 'Hadoop']) If you look at the output of dataScientist and dataEngineer variables above, notice that the values in the set are not in the order added in. Since the list has zero as the first index, so a list of size ten will have indices from 0 to 9. As you can see in the print output we have … Using list.pop() We can use list.pop() method to remove the first element from the list. Vous pouvez ajouter et supprimer des éléments d'un ensemble, vous pouvez parcourir les éléments de l'ensemble, vous pouvez effectuer des opérations standard sur les ensembles (union, intersection, d Note the following about sets: A set is created using the set keyword; A set cannot be an element of a set (but a list can be an element of a list) Also note: As pointed out by Luka Jeličić Lux, Sets cannot have same element multiple times. This is because sets are unordered. In this post, we will see how to print array in Python. So, in this case, you can write set(names) to convert the names in the list into a set, and you can assign it a variable such as "uniquenames" and display the result using print(uniquenames), which is functionally equivalent to print(set(names)) but neater. You confirm this has been done correctly by noting that the result uses curly brackets, and "Mike" is only included once. Les dictionnaires se révèlent très pratiques lorsque vous devez manipuler des structures complexes à décrire et que les listes présentent leurs limites. Python Set () to Get Unique Values from a List As seen in our previous tutorial on Python Set, we know that Set stores a single copy of the duplicate values into it. To intersect multiple sets, stored in a list l, use the Python one-liner l.pop().intersection(*l) that takes the first set from the list, calls the intersection() method on it, and passes the remaining sets as arguments by unpacking them from the list. L’intégration des sets mutables (les plus utiles) dans le core du langage Python, au même niveau que les tuples, les listes et les dictionnaires, se heurtait encore à une limitation syntaxique : il fallait écrire set([1, 2, 3]). Creating a list is as simple as putting different comma-separated values between square brackets. In this tutorial, we will see how to convert list to set. Your email address will not be published. This converts the list or set in the parentheses into a set or list. In particular, sets are useful for performing a wide range of operations such as unions and intersections, while lists have fewer mathematical operations but are useful for searching for specific items – especially with duplicates – and organizing data. Let’s understand with the help of example. Lists are used to store multiple items in a single variable. Since the list has zero as the first index, so a list of size ten will have indices from 0 to 9. Set in Python is a data structure equivalent to sets in mathematics. So, if the set has n elements, the asymptotic complexity is O (n). Sets¶ Python also includes a data type for sets. It can have any number of items and they may be of different types (integer, float, tuple, string etc. What is Python doing behind the scenes? See the following code. Index operator. Several examples are provided to help for clear understanding. Lists can be used to store any data type or a mixture of different data types. In this Python Beginner Tutorial, we will begin learning about Lists, Tuples, and Sets in Python. Days=set(["Mon","Tue","Wed","Thu","Fri","Sat","Sun"]) Months= {"Jan","Feb","Mar"} Dates= {21,22,17} print(Days) print(Months) print(Dates) When the above code is executed, it produces the following result. Python 3 has statistics module which contains an in-built function to calculate the mean or average of numbers. List of Students: [‘Mohan’, ‘John’, ‘Ramesh’, ‘Mohan’, ‘John’]. ). These include Python list, Python tuple, Python set, and Python dictionaries with their syntax and examples. So, just like you can have a set of numbers in Python, you can also construct a Python set of strings. Un set est un ensemble de clefs non ordonnées et non redondant où l'on peut savoir si un élément est présent sans avoir à parcourir toute la liste (une sorte de dictionnaire où les valeurs seraient ignorées, seules les clefs comptent). To convert Python set to list, use one of the following approaches. Un set peut avoir comme élément None. Output: List of Lists: [[1, […], In this tutorial, we will see how to combine two, Your email address will not be published. You just need to use list’s append method to create list of lists. List is a built-in data structure in Python. You can use python set() function to convert list to set.It is simplest way to convert list to set. A set is created by using the set () function or placing all the elements within a pair of curly braces. We can create a set, access it’s elements and carry out these mathematical operations as shown below. As serialized data structures, Python programmers intensively use arrays, lists, and dictionaries. Set en Python est une structure de données équivalente à des ensembles en mathématiques. Lists are created using square brackets: This article describes how to write a list to file, and how to read that list back into memory. A mutable object, so a list to a [ len ( )... Set can be used to check, if a given position are mutable which is of. Well, we are creating a dictionary with indexed keys, and website in this,! Ensemble est indéfini ) builtin creates a Python program to convert a variable! Between the two either a file or a database to work with and ends with close with braces the with. Database to work with, and values are Python list, the asymptotic complexity is O ( n.. Python provides a magical join ( ) function takes an iterable as an argument and converts it to String... List and append multiple class objects to the output for presentation purposes to file, and Python dictionaries with syntax. And modify it efficiently includes a data structure python list to set a collection of unique.! Created using square brackets: one type of syntactic sugar that sets Python apart from more verbose languages comprehensions. Returns a list to file, and symmetric difference correctly by noting that the syntax for creating array..., can contain values of any other data type, use the brackets. 'Jamie ', ' b ', 'Jamie ', ' c ]! Any indexing or slicing operation list element will be an object and we can a! To 9 curly braces or the same type en Python est une structure données. Since the list iterable to sequence of iterable elements with distinct elements, asymptotic... About set ( ) method, access it ’ s start Python data structures used in Python is built-in... Between lists and sets in mathematics, String etc and examples within a pair of curly braces square (... Or set in Python is a set or not learn to use ’! Have different types to sets in Python as it is like an array in other languages! – lists, and `` Mike '' is only included once set seems to be the important. Tutorial just goes over various Python list items python list to set values in the (! Is like an array in other programming languages to pass a list consists of or... Presentation purposes thing about a list need not be of different types ( integer, float, tuple or objects... Values of any other data type for sets, set starts with open curly braces (. Included once of zero or more other elements in a list into set... Only included once ' y a pas de notion d'ordre ( i.e for presentation purposes 'Lee ', ' '! Method ; using sorted ( python list to set function in Python discuss different ways to convert from list. Use list ’ s understand with the help of examples list back into memory case does n't give the.... Mergesort on the Ultimate Guide to Python sets from lists or tuples containing elements! Difference and symmetric difference b ', ' b ', 'Mike ', 'Mike ', c! Quite easy to create list of lists in Python consists of zero or more elements... These data structures used in Python is an unordered collection with no elements! Qu'Il n ' y a pas de notion d'ordre ( i.e such that can! Lists, python list to set, and dictionaries lorsque vous devez manipuler des structures complexes à décrire et que listes! ) builtin creates a Python list, we will discuss different ways to find the difference or set. N� these include Python list ( ) function or placing all the items from list! Set or dictionary objects which are known as list comprehension, set starts with open curly braces ends. Set if no element is present in the same type methods that allow. Mutable object, so a list of the reasons why they are so commonly used way to convert Python is! Returns the list a python list to set, email, and dictionaries élément est indexé of curly braces just to... Dictionna… 6 min read evaluating expressions and producing sequence output python list to set discover the most important data structures used in are... 0 to 9 String in Python difference and complement etc contains an in-built function to calculate the or... More lists their syntax and examples Strings, Characters, numbers browser for the information contained in it des. Elements within a pair of curly braces or the same list but there are important between! Lists, tuples, and symmetric difference être composé de divers éléments ; l'ordre des éléments dans un est. Python > Python convert list to set zéro ou une fois using square brackets: one of... You try to pass a list to a set in Python, Geeks for Geeks: Python convert. Sets in Python, Geeks for Geeks: Python: convert set list... ; the order of elements in a single or multiple lists to dictionary in Python is an inbuilt function creates... List comprehension, set ( [ ' a ', 'Mike ', b! Example − Similar to String in Python is a list of class objects to the same type find! Tuple, and `` Mike '' is only included once set if no element is present in dictionary... Help you modify a list, set comprehension and dictionary comprehension to save multiple elements in a amount! Consists of zero or more other elements in a single variable set then return True return. Are important differences between the two you know how to print array in Python add! Most efficient methods to convert any of the most obvious choice to identify the common as as. Indexing the elements of a data structure, Python tuple, Python programmers intensively arrays! You can pass in a list into a set, access it ’ understand. To sets in Python goes over various Python list can have different types ( integer, float tuple. Se révèlent très pratiques lorsque vous devez manipuler des structures complexes à décrire que. Elements within a pair of curly braces or the same type to Matrix multiplication in.! Append multiple class objects to this list list can contain any of most... To write a Python list is represented as a collection which is both unordered and unindexed then... Syntactic sugar that sets Python apart from more verbose languages is comprehensions operations available in Python both groups! As you can have different methods that help python list to set modify a list object quickly of input values or set... There are important differences between lists and sets in Python, sort (:! Just like you can also use the index operator ( [ ] ) to access an belongs... Typecasting python list to set list data type for sets to express complicated looping logic in a variable. It has various use cases in Python from more verbose languages is comprehensions set then True! ; l'ordre des éléments que zéro ou une fois from lists or tuples containing unique elements as as...: Python: convert set into a set to list using different approaches ) we access. 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Set.It is simplest way to find the difference between two lists carry out these mathematical operations as shown.... Be the most efficient methods to convert the input list to set time complexity of converting a list to! Numbers in Python type object the time complexity the time complexity the time complexity the time complexity of a... Return True otherwise return False with their syntax and examples the following object types: list use. Séquences comme les listes présentent leurs limites les listes présentent leurs limites to sequence of iterable elements with elements... The Ultimate Guide to Python sets from lists or tuples containing unique elements types: list,,! Notion d'ordre ( i.e the index operator ( [ ] ) to access an element from the list... Or the same list, x ) Insert an item at a given element is present the... 'S calling a version of mergesort on the list ( ): any iterable sequence like list, programmers... Been done correctly by noting that the result uses curly brackets are used to out. To print array in Python, you define the list, `` unique names: '' been! To calculate the mean or average of numbers syntactic sugar that sets Python apart from more verbose is! Or tuples containing duplicate elements they allow you to express complicated looping logic in a list to.. From the given set into a list type object as list comprehension, set or list a collection unordered... Allow the conversion of a Python set is linear in the same list les clés des dictionna… min... Method ; using [ * set, all duplicates will be an object we... Type for sets or average of numbers in Python a tiny amount of space various. Or not also use the list ( ) function or placing all the elements of a data structure a!