Kursinnehåll

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.

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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.

Lösning

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Avsnitt 4. Kapitel 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.

Uppgift

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.

Lösning

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 4. Kapitel 4

Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan

Python Data Structures

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with in

Iterating Through a Set with a for Loop

Lösning

Accessing Elements in a Set: Iteration and Membership Testing

Verifying Membership with in

Iterating Through a Set with a for Loop

Lösning

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop

Verifying Membership with `in`

Iterating Through a Set with a `for` Loop