Course Content

Python Data Structures

1. Mastering Python Lists

Creating Lists in Python: Declaring and Initializing Lists List Indexing in Python: Accessing Elements Efficiently Working with Nested Lists in Python Python List Length: Measuring and Managing List Size Modifying Lists in Python: Updating and Changing Elements Using the append() Method: Adding Elements to Lists Using the insert() Method: Placing Elements at Specific Positions Deleting Elements in Python Lists: Removing Items Safely Using the remove() Method: Deleting Specific Elements from Lists

2. Mastering Python Dictionaries

Creating a Dictionary in Python: Storing Key-Value Pairs Accessing Dictionary Values Accessing Dictionary Keys Adding Items to a Dictionary: Updating Key-Value Pairs Using the del Keyword: Removing Dictionary Entries Using the pop() Method: Deleting Elements with Return Values Using the popitem() Method: Removing the Last Inserted Item Using the clear() Method: Emptying a Dictionary Completely

3. Mastering Python Tuples

Creating a Tuple in Python: Defining Immutable Data Structures Accessing Elements in a Tuple: Indexing Technique Concatenating Tuples in Python: Merging Immutable Sequences Deleting Tuples in Python: Removing References to Tuples Updating Tuples in Python Adding Items to a Tuple: Alternative Approaches Using Lists Counting Elements in a Tuple: Using the count() Method Finding Elements in a Tuple: Using the index() Method for Lookup

4. Mastering Python Sets

Creating a Set in Python: Defining Unordered Collections Using the add() Method: Adding Single Elements to a Set Using the update() Method: Merging Multiple Elements into a Set Accessing Elements in a Set: Iteration and Membership Testing Using the remove() and discard() Methods Using the clear() Method: Removing All Elements from a Set

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:


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# 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.


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# 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

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Section 4. Chapter 4

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

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

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

Python Data Structures

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with in

Iterating Through a Set with a for Loop

Solution

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with in

Iterating Through a Set with a for Loop

Solution

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop