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Python | Convert set into a list

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Given a set, write a Python program to convert the given Set to List.

Input : ('Geeks', 'for', 'geeks')
Output : ['Geeks', 'for', 'geeks']
Explanation: The data type of the input is set <class 'set'>  and 
                        the data type of the output is list <class 'list'>.

Convert the set into a List in Python

Below are the methods to convert Set to List that we will cover below:

Convert Set to List using the list Method

Here we pass the set datatype inside the list parentheses as a parameter and this will convert the set data type into a list data type as shown in the code below.

Python3




# set into a list
my_set = {'Geeks', 'for', 'geeks'}
print(type(my_set))
 
s = list(my_set)
print(type(s))


Output:

['Geeks', 'for', 'geeks']

Time complexity: O(n)
Auxiliary Space: O(n)

Set into a List using the sorted() method

Using the sorted() function will convert the set into a list in a defined order. The only drawback of this method is that the elements of the set need to be sortable. 

Python3




# convert a set into a list
def convert(set):
    return sorted(set)
 
# Driver function
my_set = {1, 2, 3}
 
s = set(my_set)
print(convert(s))


Output:

[1, 2, 3]

Time complexity: O(n)
Auxiliary Space: O(n)

Convert the set into a list using the map() function

You can use the map() function to convert the set to a list by passing the set as an argument to the map() function and returning a list of the results. For example:

Python3




# program to convert a  set into a list
def convert(s):
    return list(map(lambda x: x, s))
# Driver function
s = {1, 2, 3}
print(convert(s))


Output:

[1, 2, 3]

Time complexity: O(n)
Auxiliary Space: O(n)

Convert Set to List using List Comprehension

You can use list comprehension to create a new list from the elements in the set as shown in the code below.

Python3




def convert(s):
    # Use a list comprehension to create a new list from the elements in the set
    return [elem for elem in s]
 
s = {1, 2, 3}
print(convert(s))


Output:

[1, 2, 3]

Time complexity: O(n)
Auxiliary Space: O(n)

Convert Set into a List using [*set, ]

This essentially unpacks the set s inside a list literal which is created due to the presence of the single comma (, ). This approach is a bit faster but suffers from readability. 

For example:

Python3




#program to convert a  set into a list
def convert(set):
    return [*set, ]
 
# Driver function
s = set({1, 2, 3})
print(convert(s))


Output:

[1, 2, 3]

Time complexity: O(n)
Auxiliary Space: O(n)

Convert Set to List using list() constructor

You can use the list() constructor to convert a set to a list directly, In below code we creates a set `my_set` with elements 1 to 5, then converts it into a list `my_list` using the `list()` constructor, and prints the resulting list. The output is `[1, 2, 3, 4, 5]`.

Python3




my_set = {1, 2, 3, 4, 5}
my_list = list(my_set)
print(my_list)


Output :

[1, 2, 3, 4, 5]

Time complexity: O(n)
Auxiliary Space: O(n)

Convert Set to List using copy and clear

You can make a copy of the set and then clear the set to get an empty set, which can be used to create an empty list. As the below code creates a set `my_set` with elements 6 to 10, makes a copy of the set as a list `my_list`, clears the original set, and prints the copied list. The output is `[6, 7, 8, 9, 10]`.

Python3




my_set = {6, 7, 8, 9, 10}
my_list = list(my_set.copy())
my_set.clear()
print(my_list)


Output :

[6, 7, 8, 9, 10]

Time complexity: O(n)
Auxiliary Space: O(n)



Last Updated : 07 Dec, 2023
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