2D Lists
Computer Science: KS3, topic 2.1.17
2D Lists
A 2D list is the data structure which consists of a list of lists.
2D List
- A 2D list is a data structure where lists are filled with other lists.
- This can be used to represent a 2D surface, or records.
Accessing elements
- To access an individual list we can access the list as usual:
- list = my2DList[4]
- To access an individual element, we use this syntax:
- list[5][0]
- This would get the first element ([0]), of the sixth list ([5]).
Uses of 2D lists
- 2D lists are often used to represent a 2D surface, for example, a chess board:
- Each element of the 2D list could contain the chess piece in that location.
- 2D lists can be used to represent a database:
- Each inner list represents a single record (row) in the database.
- The outer list contains all the records, representing the entire table.
Test yourself on 2D Lists
What would the command list[5].append(3) do to a 2D list?