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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() Method
2. Dictionary
Creating a DictionaryAccessing Dictionary ValuesAccessing Dictionary KeysAdding ItemsThe del KeywordThe pop() MethodThe popitem() MethodThe clear() Method
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

book
The del Keyword

In Python, you can remove keys from a dictionary using the del keyword. This allows you to delete specific entries or even clear the entire dictionary. Let's explore how this works using a library-related example.


              
123456789101112

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance",
    "copies": 5
}

# Deleting a key value
del book["copies"]

print(book)
copy

Deleting the Entire Dictionary

If you want to delete the entire dictionary, you can do so with del. However, be careful—this action removes the dictionary completely, and any further reference to it will raise an error.


              
1234567891011

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

# Deleting the entire dictionary
del book
# Attempting to print the dictionary after deletion will cause an error
print(book)  # This line will raise a NameError
copy
Task

Swipe to start coding

We are continuing to work with the dictionary authors_books.

Your goal:

  • Remove the element with the key "J.K. Rowling" from the dictionary.
  • Use the del keyword to do this.

Solution

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Section 2. Chapter 5
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book
The del Keyword

In Python, you can remove keys from a dictionary using the del keyword. This allows you to delete specific entries or even clear the entire dictionary. Let's explore how this works using a library-related example.


              
123456789101112

            
book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "genre": "Romance",
    "copies": 5
}

# Deleting a key value
del book["copies"]

print(book)
copy

Deleting the Entire Dictionary

If you want to delete the entire dictionary, you can do so with del. However, be careful—this action removes the dictionary completely, and any further reference to it will raise an error.


              
1234567891011

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

# Deleting the entire dictionary
del book
# Attempting to print the dictionary after deletion will cause an error
print(book)  # This line will raise a NameError
copy
Task

Swipe to start coding

We are continuing to work with the dictionary authors_books.

Your goal:

  • Remove the element with the key "J.K. Rowling" from the dictionary.
  • Use the del keyword to do this.

Solution

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 5
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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