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Python Data Structures
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Python Data Structures

Python Data Structures

1. Mastering Python Lists
Creating Lists in Python: Declaring and Initializing ListsList Indexing in Python: Accessing Elements EfficientlyWorking with Nested Lists in PythonPython List Length: Measuring and Managing List SizeModifying Lists in Python: Updating and Changing ElementsUsing the append() Method: Adding Elements to ListsUsing the insert() Method: Placing Elements at Specific PositionsDeleting Elements in Python Lists: Removing Items SafelyUsing the remove() Method: Deleting Specific Elements from Lists
2. Mastering Python Dictionaries
Creating a Dictionary in Python: Storing Key-Value PairsAccessing Dictionary ValuesAccessing Dictionary KeysAdding Items to a Dictionary: Updating Key-Value PairsUsing the del Keyword: Removing Dictionary EntriesUsing the pop() Method: Deleting Elements with Return ValuesUsing the popitem() Method: Removing the Last Inserted ItemUsing the clear() Method: Emptying a Dictionary Completely
3. Mastering Python Tuples
Creating a Tuple in Python: Defining Immutable Data StructuresAccessing Elements in a Tuple: Indexing TechniqueConcatenating Tuples in Python: Merging Immutable SequencesDeleting Tuples in Python: Removing References to TuplesUpdating Tuples in PythonAdding Items to a Tuple: Alternative Approaches Using ListsCounting Elements in a Tuple: Using the count() MethodFinding Elements in a Tuple: Using the index() Method for Lookup
4. Mastering Python Sets
Creating a Set in Python: Defining Unordered CollectionsUsing the add() Method: Adding Single Elements to a SetUsing the update() Method: Merging Multiple Elements into a SetAccessing Elements in a Set: Iteration and Membership TestingUsing the remove() and discard() MethodsUsing the clear() Method: Removing All Elements from a Set

book
Using the del Keyword: Removing Dictionary Entries

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.

python

              
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
Uppgift

Swipe to start coding

We are continuing to work with the dictionary authors_books.

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

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 5
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book
Using the del Keyword: Removing Dictionary Entries

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.

python

              
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
Uppgift

Swipe to start coding

We are continuing to work with the dictionary authors_books.

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

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 2. Kapitel 5
Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Vi beklagar att något gick fel. Vad hände?
some-alt