We can convert a Set to List in Python using the built-in list() method. Let’s take a look at some examples using this function.
Methods to Convert a Set to List in Python
We’ll go over simple methods that will allow the conversion of a python set object to a list object quickly.
1. Using list() Function
The list() function takes an iterable as an argument and converts that into a List type object. This is a built-in method ready for you to use.
my_list = list(my_iterable)
Since a set is also iterable, we can pass it into the list() method and get our corresponding list.
my_set = set({1, 4, 3, 5})
my_list = list(my_set)
print(my_list)
The output, as expected, will be a list containing the above values.
[1, 3, 4, 5]
Note that the order of the list can be random, and not necessarily sorted.
For example, take the below snippet.
s = set()
s.add("A")
s.add("B")
print(list(s))
Output in my case:
['B', 'A']
2. Using Manual Iteration
We can also manually add the elements to the list since the set is iterable. This method does not have any real-world advantage over using the list() method apart from being written by you.
s = set({1, 2, 3})
a = []
for i in s:
a.append(i)
print(a)
Again, the output is a list:
[1, 2, 3]
Convert a frozenset to a list
The Python frozenset object is similar to a set but is immutable. Therefore, we cannot modify the elements of a frozenset. We can convert this type of set too, using list().
f_set = frozenset({1, 3, 2, 5})
a = list(f_set)
print(a)
Output
[1, 2, 3, 5]
References
- JournalDev article on converting a Set into a List