Given a set, write a Python program to convert the given set into a list.
Input : ('Geeks', 'for', 'Lazyroar')
Output : ['Geeks', 'for', 'Lazyroar']
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
Below are the methods that we will cover in this article:
- Using list method
- Using sorted() method
- Using the map() function
- Using list comprehension
- Using [*set, ]
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 listmy_set = {'Geeks', 'for', 'Lazyroar'}print(type(my_set))s = list(my_set)print(type(s)) |
['Geeks', 'for', 'Lazyroar']
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 listdef convert(set): return sorted(set)# Driver functionmy_set = {1, 2, 3}s = set(my_set)print(convert(s)) |
[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 listdef convert(s): return list(map(lambda x: x, s))# Driver functions = {1, 2, 3}print(convert(s)) |
[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)) |
[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 listdef convert(set): return [*set, ]# Driver functions = set({1, 2, 3})print(convert(s)) |
[1, 2, 3]
Time complexity: O(n)
Auxiliary Space: O(n)
