Do you want to add or append values to a Set in Python? This article will show you how to add values to a set in Python.
A set is a type of dictionary that does not allow duplicate entries. As a result, if you want a list of unique values, you should use a set.
To add a single value to a set in Python, use the add() method, which is available for Set. If you want to add multiple values to a set at once, you must use the update() method.
How To Add Values To A Empty or Non-Empty Set Using Add()
You can add any values or elements to the set using the add() method. This set can be empty or nonempty; either way, the values will be added. However, in the case of the Add method, you can only add a single element at a time.
Let’s look at how the Add Method is used in the code below.
#Creating a Empty Set
givenSet = set()
#Adding Single Item to Set
givenSet.add('A')
givenSet.add('B')
#Printing the Set
print(givenSet)
Output:
{'A', 'B'}As you can see, we added two elements one by one using the set class’s add method.
How to Append Multiple Values to a Set in Python
In Python, you must use the update() method to append multiple values to a Set. Alternatively, you can use ‘|’ to concatenate the list of values to the set.
Let’s look at how to update and ‘|’ are used in the code below.
Using Update Method
#Creating a Empty Set
givenSet = set()
#Adding Single Item to Set
givenSet.add('A')
givenSet.add('B')
listToAddToSet = ['C', 'D']
givenSet.update(listToAddToSet)
#Printing the Set
print(givenSet)
Output:
{'D', 'B', 'A', 'C'}As you can see from the code above, we can easily add multiple values to a set by using the update method.
Using ‘|’ to Append Multiple Values to a Set
#Creating a Empty Set
givenSet = set()
#Adding Single Item to Set
givenSet.add('A')
givenSet.add('B')
givenSet = givenSet | {'C', 'D'}
#Printing the Set
print(givenSet)
Output:
{'C', 'A', 'D', 'B'}So, in Python, we were able to add another set of values to the given set by using ‘|’.
Using Union Method To Add Multiple Values to A Set
There is a Union[1] method present in the set class that can be used to add or append different set values into a single set.
Let’s look at how to use the union method in Python in the code below.
#Creating a Empty Set
givenSet = set()
#Adding Single Item to Set
givenSet.add('A')
givenSet.add('B')
#Performing Union of Two Set
givenSet = givenSet.union({'C','D'})
#Performing Union with list of Values
givenSet = givenSet.union(['E', 'F'])
#Printing the Set
print(givenSet)
Output:
{'F', 'E', 'D', 'C', 'A', 'B'}Using the above code, we were able to successfully add a list of values as well as the different set values to the existing set of values.
Wrap Up
I hope you were able to find an answer to your question about how to add or append values to a set in Python. You learned four different ways to do so in this lesson.
The first method describes how to add a single value to a Python set. In Python, every other method refers to the addition of multiple values to a set.
If you have a better method than the one discussed above, please let me know and I will gladly add it here.
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