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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.

Uppgift

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.

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 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.

Uppgift

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.

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 1. Kapitel 8
Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Vi beklagar att något gick fel. Vad hände?
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