Kursinnhold

Python Data Structures

1. Mastering Python Lists

Creating Lists in Python: Declaring and Initializing Lists List Indexing in Python: Accessing Elements Efficiently Working with Nested Lists in Python Python List Length: Measuring and Managing List Size Modifying Lists in Python: Updating and Changing Elements Using the append() Method: Adding Elements to Lists Using the insert() Method: Placing Elements at Specific Positions Deleting Elements in Python Lists: Removing Items Safely Using the remove() Method: Deleting Specific Elements from Lists

2. Mastering Python Dictionaries

Creating a Dictionary in Python: Storing Key-Value Pairs Accessing Dictionary Values Accessing Dictionary Keys Adding Items to a Dictionary: Updating Key-Value Pairs Using the del Keyword: Removing Dictionary Entries Using the pop() Method: Deleting Elements with Return Values Using the popitem() Method: Removing the Last Inserted Item Using the clear() Method: Emptying a Dictionary Completely

3. Mastering Python Tuples

Creating a Tuple in Python: Defining Immutable Data Structures Accessing Elements in a Tuple: Indexing Technique Concatenating Tuples in Python: Merging Immutable Sequences Deleting Tuples in Python: Removing References to Tuples Updating Tuples in Python Adding Items to a Tuple: Alternative Approaches Using Lists Counting Elements in a Tuple: Using the count() Method Finding Elements in a Tuple: Using the index() Method for Lookup

4. Mastering Python Sets

Creating a Set in Python: Defining Unordered Collections Using the add() Method: Adding Single Elements to a Set Using the update() Method: Merging Multiple Elements into a Set Accessing Elements in a Set: Iteration and Membership Testing Using the remove() and discard() Methods Using the clear() Method: Removing All Elements from a Set

Using the insert() Method: Placing Elements at Specific Positions

What if we want to add an item not at the end of the list, but at a specific position? For this purpose, we use the insert() method.

The syntax for the insert() method is:

python

index: the position in the list where you want to add the new element. Remember, Python uses zero-based indexing;
element: the item you want to insert into the list.

Imagine planning a trip and having a list of cities you want to visit.


              123
            
travel_wishlist = ["Paris", "Oslo", "Kyoto", "Sydney"]

print(travel_wishlist)  # Output: ['Paris', 'Oslo', 'Kyoto', 'Sydney']

This list contains four items:

However, your plans change, and you decide to adjust the order of destinations. Now, you want to prioritize "Chicago" as the first destination.


              12345
            
travel_wishlist = ["Paris", "Oslo", "Kyoto", "Sydney"]

# Adding "Rome" as the first destination
travel_wishlist.insert(0, "Chicago")
print(travel_wishlist)  # Output: ['Chicago', 'Paris', 'Oslo', 'Kyoto', 'Sydney']

After this, "Chicago" takes the 0 index. It's now at the top, and the rest of the items have shifted down. So, we now have 5 items:

Note

With the insert() function, you can add only one item at once.

Oppgave

Swipe to start coding

You have the travel_wishlist list.

Prioritize two specific cities for your travels using the insert() method.

Add the "London" city as the new first destination in your list;
Then, add the "Budapest" city right after the trip to "Paris".

Løsning

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Seksjon 1. Kapittel 7

Using the insert() Method: Placing Elements at Specific Positions

What if we want to add an item not at the end of the list, but at a specific position? For this purpose, we use the insert() method.

The syntax for the insert() method is:

python

index: the position in the list where you want to add the new element. Remember, Python uses zero-based indexing;
element: the item you want to insert into the list.

Imagine planning a trip and having a list of cities you want to visit.


              123
            
travel_wishlist = ["Paris", "Oslo", "Kyoto", "Sydney"]

print(travel_wishlist)  # Output: ['Paris', 'Oslo', 'Kyoto', 'Sydney']

This list contains four items:

However, your plans change, and you decide to adjust the order of destinations. Now, you want to prioritize "Chicago" as the first destination.


              12345
            
travel_wishlist = ["Paris", "Oslo", "Kyoto", "Sydney"]

# Adding "Rome" as the first destination
travel_wishlist.insert(0, "Chicago")
print(travel_wishlist)  # Output: ['Chicago', 'Paris', 'Oslo', 'Kyoto', 'Sydney']

After this, "Chicago" takes the 0 index. It's now at the top, and the rest of the items have shifted down. So, we now have 5 items:

Note

With the insert() function, you can add only one item at once.

Oppgave

Swipe to start coding

You have the travel_wishlist list.

Prioritize two specific cities for your travels using the insert() method.

Add the "London" city as the new first destination in your list;
Then, add the "Budapest" city right after the trip to "Paris".

Løsning

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 1. Kapittel 7

Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor