2.1.1

Lists

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Lists

Lists are a data structure quite similar to an array.

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Lists

  • Lists store multiple elements of different data types under the same identifier.
  • There can be a variable number of elements - they never get full.
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Lists in pseudocode

  • A list can be declared as follows:
    • pupils = []
  • Values can be added to the end of the list as follows:
    • pupils.append("Alice")
  • Values can be accessed as follows:
    • print("The first student is " + pupils[0])

2D Lists

A 2D list is the data structure which consists of a list of lists.

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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.
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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]).
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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 can store a record of the database.
    • The outer list can store each record.

Jump to other topics

1Introduction to Python

1.1Python

1.1.1Python

1.2Input & Output

1.2.1Input & Output

1.3Data Types

1.3.1Data Types

1.4Variables & Constants

1.4.1Variables & Constants

1.5Operators

1.5.1Arithmetic & Relational Operators

1.5.2Boolean & Assignment Operators 2

1.6Program Flow

1.6.1Selection

1.6.2Iteration

2Data Structures

2.1Lists & Strings

2.1.1Lists

2.1.2Strings

2.2File Handling

2.2.1File Handling

3Modularity

3.1Subroutines

3.1.1Subroutines

3.2Data Flow

3.2.1Data Flow

4Good Practice

4.1Naming & Whitespace

4.1.1Identifiers

4.1.2Whitespace

4.2Comments

4.2.1Comments

4.3Exceptions

4.3.1Exceptions

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Iteration

Strings