Change List Items
3 min read ·
Lists in Python are mutable, which means you can change, update, or replace items after the list is created.
This makes lists extremely flexible for real-world data manipulation.
This topic covers all valid ways to change list items, from simple updates to advanced slicing techniques.
Change a Single List Item
You can change a specific item by referring to its index number.
Change a Range of List Items (Slicing)
You can replace multiple items at once using slicing.
Change List Size While Replacing
The number of new items does not have to match the number being replaced.
Replace with More Items
Replace with Fewer Items
Change Items Using Negative Indexes
Change Items Using Loops
Using Index Loop
Using Conditional Logic
Change Nested List Items
Lists can contain other lists.
Change List Items Using List Comprehension
Common Mistakes
Assigning to an Out-of-Range Index
This raises:
Forgetting That Slicing Replaces
The list size changes.
Key Difference: Change vs Add
- Changing requires the index to exist
- Adding creates new items
This topic prepares you for:
- Add List Items
- Remove List Items
- List Comprehensions
- Real-world list transformations