Sets in Python
Hey there! In this guide, we'll explore sets in Python. Sets are unordered collections of unique elements that allow you to perform various operations like union, intersection, and difference. Let's dive in!
Python Sets
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Sets are unordered collections of unique elements.
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They are mutable, which means you can change their contents after creation.
Video Explanation
1. Creating a Set
You can create a set using curly braces {} or the set() function.
my_set = {1, 2, 3, 4} # Create a set using curly braces
another_set = set([3, 4, 5, 6]) # Create a set using the set() function
print(my_set) # Output: {1, 2, 3, 4}
print(another_set) # Output: {3, 4, 5, 6}
2. Accessing Elements
Sets do not support indexing, but you can check for the existence of an element using the in keyword.
my_set = {1, 2, 3, 4} # Define a set
print(2 in my_set) # Check if 2 is in the set, Output: True
print(5 in my_set) # Check if 5 is in the set, Output: False
3. Adding Elements
You can add elements to a set using the add() method.
my_set.add(5) # Add an element to the set
print(my_set) # Output: {1, 2, 3, 4, 5}
4. Removing Elements
To remove elements, you can use the remove() method or the discard() method.
my_set.remove(3) # Remove an element (raises error if not found)
print(my_set) # Output: {1, 2, 4, 5}
my_set.discard(2) # Remove an element (does not raise error if not found)
print(my_set) # Output: {1, 4, 5}
5. Set Operations
Sets support various mathematical operations like union, intersection, and difference.
set1 = {1, 2, 3} # Define the first set
set2 = {3, 4, 5} # Define the second set
union_set = set1 | set2 # Union operation
intersection_set = set1 & set2 # Intersection operation
difference_set = set1 - set2 # Difference operation
print(union_set) # Output: {1, 2, 3, 4, 5}
print(intersection_set) # Output: {3}
print(difference_set) # Output: {1, 2}
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