Learn Accessing Elements in a Set: Iteration and Membership Testing

Because sets are unordered, you cannot access their elements by index like you would with a list or tuple. However, you can:

Check for the existence of an element using the in keyword;
Iterate through the elements using a for loop.

Verifying Membership with `in`

The in keyword allows you to check if a specific element exists within a set:


              12345678910
            
# Define a set of favorite movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk", "Memento"}

# Check if specific movies are in the set
is_inception_present = "Inception" in movies  # True
is_avatar_present = "Avatar" in movies        # False

# Print results
print(is_inception_present)  # Output: True
print(is_avatar_present)     # Output: False

In this example, we use the in keyword to check if specific movies are present in the movies set and store the result as a boolean value in variables is_inception_present and is_avatar_present.

Iterating Through a Set with a `for` Loop

You can iterate over a set using a for loop to process each element individually. Since sets are unordered, the iteration order is unpredictable.


              1234567
            
# Define a set of favorite movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk", "Memento"}

# Iterate through the set and print each movie title
print("Movie collection:")
for movie in movies:
    print(movie)

Each element in the set is accessed once during iteration. The order of elements in the output may vary.

Task

Swipe to start coding

You are given a fairly large set of the most popular movies.

Assign a boolean value to the variable is_first_movie_present to check if the movie "The Green Mile" is in the set.
Assign a boolean value to the variable is_second_movie_present to check if the movie "Titanic" is in the set.
Assign a boolean value to the variable is_third_movie_present to check if the movie "Interstellar" is in the set.
Use the in keyword to accomplish this task.

Solution

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 4

single

Ask AI

Ask anything or try one of the suggested questions to begin our chat

Swipe to show menu

Because sets are unordered, you cannot access their elements by index like you would with a list or tuple. However, you can:

Check for the existence of an element using the in keyword;
Iterate through the elements using a for loop.

Verifying Membership with `in`

The in keyword allows you to check if a specific element exists within a set:


              12345678910
            
# Define a set of favorite movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk", "Memento"}

# Check if specific movies are in the set
is_inception_present = "Inception" in movies  # True
is_avatar_present = "Avatar" in movies        # False

# Print results
print(is_inception_present)  # Output: True
print(is_avatar_present)     # Output: False

Iterating Through a Set with a `for` Loop

You can iterate over a set using a for loop to process each element individually. Since sets are unordered, the iteration order is unpredictable.


              1234567
            
# Define a set of favorite movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk", "Memento"}

# Iterate through the set and print each movie title
print("Movie collection:")
for movie in movies:
    print(movie)

Each element in the set is accessed once during iteration. The order of elements in the output may vary.

Task

Swipe to start coding

You are given a fairly large set of the most popular movies.

Assign a boolean value to the variable is_first_movie_present to check if the movie "The Green Mile" is in the set.
Assign a boolean value to the variable is_second_movie_present to check if the movie "Titanic" is in the set.
Assign a boolean value to the variable is_third_movie_present to check if the movie "Interstellar" is in the set.
Use the in keyword to accomplish this task.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 4

single

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop

Solution

Awesome!

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop

Solution

Awesome!

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with in

Iterating Through a Set with a for Loop

Solution

Awesome!

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with in

Iterating Through a Set with a for Loop

Solution

Awesome!

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop