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Accessing 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.


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

Iterating Through Keys

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


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

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

Checking for the Existence of a Key

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


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

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

Task

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You are given a dictionary authors_books, where the key is the author and the value is a list of their book titles.

Initialize the variable keys as a object of the dictionary keys.
Initialize the variable all_books as a list of all available book titles.
Use a for loop to get the book lists by author.
Use a nested for loop and the append() method to fill the all_books list with all available books.

Solution

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Section 2. Chapter 3

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Accessing 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'])

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)

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.")

Task

Swipe to start coding

You are given a dictionary authors_books, where the key is the author and the value is a list of their book titles.

Initialize the variable keys as a object of the dictionary keys.
Initialize the variable all_books as a list of all available book titles.
Use a for loop to get the book lists by author.
Use a nested for loop and the append() method to fill the all_books list with all available books.

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!

Swipe to show menu

Accessing Dictionary Keys

Iterating Through Keys

Checking for the Existence of a Key

Solution

Awesome!

Accessing Dictionary Keys

Iterating Through Keys

Checking for the Existence of a Key

Solution

Awesome!