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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
Deleting Elements in Python Lists: Removing Items Safely

The del keyword allows you to delete an element at a specific index in the list. This is useful when you know the exact position of the item you want to remove.

The syntax of del keyword is:

python
  • The statement starts with the keyword del;
  • Next, you typically identify the list item with its index, like list[index].

Let's say you have a list of cities in your travel itinerary:

python

You've decided to remove the city "Sydney", which is the last destination on your list. Using del and negative indexing:


              
12345

            
travel_wishlist = ["Paris", "Oslo", "Kyoto", "Sydney"]

# Remove the last city
del travel_wishlist[-1]
print(travel_wishlist) # Output: ['Paris', 'Oslo', 'Kyoto']
copy

Now, the list is down to three cities:

You can remove any item from the list by using its index number.

Opgave

Swipe to start coding

You are working with the travel_wishlist list.

  • Remove the "Paris" and "Kyoto" cities from your travel_wishlist.
  • Use the del keyword two times to do this.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

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Sektion 1. Kapitel 8
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book
Deleting Elements in Python Lists: Removing Items Safely

The del keyword allows you to delete an element at a specific index in the list. This is useful when you know the exact position of the item you want to remove.

The syntax of del keyword is:

python
  • The statement starts with the keyword del;
  • Next, you typically identify the list item with its index, like list[index].

Let's say you have a list of cities in your travel itinerary:

python

You've decided to remove the city "Sydney", which is the last destination on your list. Using del and negative indexing:


              
12345

            
travel_wishlist = ["Paris", "Oslo", "Kyoto", "Sydney"]

# Remove the last city
del travel_wishlist[-1]
print(travel_wishlist) # Output: ['Paris', 'Oslo', 'Kyoto']
copy

Now, the list is down to three cities:

You can remove any item from the list by using its index number.

Opgave

Swipe to start coding

You are working with the travel_wishlist list.

  • Remove the "Paris" and "Kyoto" cities from your travel_wishlist.
  • Use the del keyword two times to do this.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 8
Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
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