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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 remove() Method: Deleting Specific Elements from Lists

The remove() method deletes the first occurrence of a specific value in the list. This is particularly useful when you know the element's value but not its index.

The syntax of remove() method is:

python

Now, you decide to remove "Kyoto" from your list because you've already visited it. Here's how you can do it:


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

# Remove a specific city
travel_wishlist.remove("Kyoto")
print(travel_wishlist)  # Output: ['Paris', 'Oslo', 'Sydney']
copy

If "Kyoto" isn't on the list, this code will raise an error.


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

# Remove a specific city
travel_wishlist.remove("Kyoto")
print(travel_wishlist)  # ValueError: list.remove(x): x not in list
copy

To avoid this, you can check if the city exists before removing it:


              
123456

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

if "Kyoto" in travel_wishlist:
    travel_wishlist.remove("Kyoto")

print(travel_wishlist)
copy

Note

With the remove() method, you can only take out one item at a time.

Opgave

Swipe to start coding

You are continuing to work with the travel_wishlist list.

  • Remove the elements "Oslo" and "Sydney" from the list.
  • Use the remove() method to remove these elements.

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 9
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book
Using the remove() Method: Deleting Specific Elements from Lists

The remove() method deletes the first occurrence of a specific value in the list. This is particularly useful when you know the element's value but not its index.

The syntax of remove() method is:

python

Now, you decide to remove "Kyoto" from your list because you've already visited it. Here's how you can do it:


              
12345

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

# Remove a specific city
travel_wishlist.remove("Kyoto")
print(travel_wishlist)  # Output: ['Paris', 'Oslo', 'Sydney']
copy

If "Kyoto" isn't on the list, this code will raise an error.


              
12345

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

# Remove a specific city
travel_wishlist.remove("Kyoto")
print(travel_wishlist)  # ValueError: list.remove(x): x not in list
copy

To avoid this, you can check if the city exists before removing it:


              
123456

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

if "Kyoto" in travel_wishlist:
    travel_wishlist.remove("Kyoto")

print(travel_wishlist)
copy

Note

With the remove() method, you can only take out one item at a time.

Opgave

Swipe to start coding

You are continuing to work with the travel_wishlist list.

  • Remove the elements "Oslo" and "Sydney" from the list.
  • Use the remove() method to remove these elements.

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 9
Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Vi beklager, at noget gik galt. Hvad skete der?
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