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Python Data Structures
course content

Course Content

Python Data Structures

Python Data Structures

1. List
Creating a ListList IndexingNested ListList LengthModifying a ListThe append() MethodThe insert() MethodDeleting ElementsThe remove() MethodList ComprehensionsList Comprehansions with Conditions
2. Dictionary
Creating a DictionaryAccessing Dictionary ValuesAccessing Dictionary KeysAdding ItemsChallenge: Expand the DictionaryThe del KeywordThe pop() MethodThe popitem() MethodThe clear() MethodDictionary ComprehensionsDictionary Comprehension with Condition
3. Tuple
Creating a Tuple Accessing Elements in a TupleConcatenating TuplesDeleting a TupleUpdating a TupleAdding Items to a TupleCounting Elements in a TupleFinding Elements in a Tuple
4. Set
Creating a SetThe add() MethodThe update() MethodAccessing the Elements of a SetThe remove() and discard() MethodsThe clear() Method

bookAccessing Dictionary Keys

To access the keys of a dictionary in Python, you can use the keys() method. This returns a view object that displays all the keys in the dictionary.


              
12345678

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}
keys = book.keys()
print(keys)  # Output: dict_keys(['title', 'author', 'year', 'genre'])
copy

Iterating Through Keys

You can iterate through the keys in a dictionary using a for loop:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

for key in book.keys():
    print(key)
copy

Checking for the Existence of a Key

Use the in keyword to check if a specific key exists in the dictionary:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

if "author" in book:
    print("The 'author' key exists in the dictionary.")
copy
Task
test

Swipe to show code editor

  1. Use the keys() method to retrieve and print all the keys in the dictionary.
  2. Use a for loop to iterate through the keys and print each key on a new line.
  3. Check if the key "genre" exists in the dictionary using an if statement and print an appropriate message.

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Section 2. Chapter 3
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bookAccessing Dictionary Keys

To access the keys of a dictionary in Python, you can use the keys() method. This returns a view object that displays all the keys in the dictionary.


              
12345678

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}
keys = book.keys()
print(keys)  # Output: dict_keys(['title', 'author', 'year', 'genre'])
copy

Iterating Through Keys

You can iterate through the keys in a dictionary using a for loop:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

for key in book.keys():
    print(key)
copy

Checking for the Existence of a Key

Use the in keyword to check if a specific key exists in the dictionary:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

if "author" in book:
    print("The 'author' key exists in the dictionary.")
copy
Task
test

Swipe to show code editor

  1. Use the keys() method to retrieve and print all the keys in the dictionary.
  2. Use a for loop to iterate through the keys and print each key on a new line.
  3. Check if the key "genre" exists in the dictionary using an if statement and print an appropriate message.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 3
toggle bottom row

bookAccessing Dictionary Keys

To access the keys of a dictionary in Python, you can use the keys() method. This returns a view object that displays all the keys in the dictionary.


              
12345678

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}
keys = book.keys()
print(keys)  # Output: dict_keys(['title', 'author', 'year', 'genre'])
copy

Iterating Through Keys

You can iterate through the keys in a dictionary using a for loop:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

for key in book.keys():
    print(key)
copy

Checking for the Existence of a Key

Use the in keyword to check if a specific key exists in the dictionary:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

if "author" in book:
    print("The 'author' key exists in the dictionary.")
copy
Task
test

Swipe to show code editor

  1. Use the keys() method to retrieve and print all the keys in the dictionary.
  2. Use a for loop to iterate through the keys and print each key on a new line.
  3. Check if the key "genre" exists in the dictionary using an if statement and print an appropriate message.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

To access the keys of a dictionary in Python, you can use the keys() method. This returns a view object that displays all the keys in the dictionary.


              
12345678

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}
keys = book.keys()
print(keys)  # Output: dict_keys(['title', 'author', 'year', 'genre'])
copy

Iterating Through Keys

You can iterate through the keys in a dictionary using a for loop:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

for key in book.keys():
    print(key)
copy

Checking for the Existence of a Key

Use the in keyword to check if a specific key exists in the dictionary:


              
123456789

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance"
}

if "author" in book:
    print("The 'author' key exists in the dictionary.")
copy
Task
test

Swipe to show code editor

  1. Use the keys() method to retrieve and print all the keys in the dictionary.
  2. Use a for loop to iterate through the keys and print each key on a new line.
  3. Check if the key "genre" exists in the dictionary using an if statement and print an appropriate message.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 2. Chapter 3
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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