Variables & Constants

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Variables and Constants

Variables and constants allow us to store results in the main store.

Variables

Variables are named spaces in the memory where data can be stored.
The value of a variable is the data stored inside it.
The value can change whilst the program is running.

Constants

Constants are similar to variables, but the value cannot change whilst the program is running.
Constants make the code easier to read.

Assignment

To use a variable, we give it a name and a value. For example:
- x = 50
We can then use this variable in other expressions by using its identifier (name).

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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