How to find the union of two lists in Python

How to find the union of two lists in Python.

Here's a step-by-step tutorial on how to find the union of two lists in Python.

1. First, let's create two lists that we want to find the union of. For this example, let's assume we have the following lists:

   list1 = [1, 2, 3, 4]
   list2 = [3, 4, 5, 6]

2. To find the union of these two lists, we can use the union operator (|) in Python. However, before we can use it, we need to convert our lists into sets.

   set1 = set(list1)
   set2 = set(list2)

Converting the lists to sets allows us to take advantage of the set operations, such as finding the union.

3. Now that we have the sets, we can find the union by using the union operator (|). This operator combines the elements of both sets, removing any duplicates.

   union_set = set1 | set2

The resulting union_set will contain all the unique elements from both set1 and set2.

4. If you want to convert the resulting set back to a list, you can use the list() function.

   union_list = list(union_set)

The union_list will now contain the union of the two original lists.

Here's the complete code:

list1 = [1, 2, 3, 4]
list2 = [3, 4, 5, 6]

set1 = set(list1)
set2 = set(list2)

union_set = set1 | set2
union_list = list(union_set)

print(union_list)

Output:

[1, 2, 3, 4, 5, 6]

In this example, the union of list1 and list2 is [1, 2, 3, 4, 5, 6].