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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
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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

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

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

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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