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Assessment GCSE
Year 9 Year 10 Year 11
3.1 Algorithms
Effective Notetaking Understanding Algorithms Decomposition Abstraction Flowcharts Flowcharts 2 Trace Tables Searching Algorithms Bubble Sort Merge Sort
3.2 Programming
Imperative Languages Variables Data Types Input/Output Arithmetic Operators Comparison Operators Using Selection For - loops While - loops Data Structures String Manipulation Random Numbers File Operations Procedures Program Structure Data Validation Data Authentication Errors and testing high and low level languages
3.3 Data representation
3.3.1 - Number Bases 3.3.2 - Converting Number Bases 1 3.3.4 - Binary Arithmetic 3.3.2 - Converting Number Bases 2 3.3.3 - Units of Information 3.3.5 - Character Encoding 3.3.6 - Representing images 3.3.7 - Representing Sound 3.3.8 - Data Compression 3.3.8 - Huffman Coding
3.4 Computer Systems
Boolean Logic Operating systems Utility Software Computer Architecture CPU Types of Memory Storage Media
3.5 Computer Networks
Networks Overview Network Topologies Network Hardware Network Protocols Network Security Network Layers

Overview

Learning Objectives

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ID	Skill_name
3.2.2.2	I can understand and know how to use a variable and constant declaration in a computer program.
3.2.2.3	I can understand why I should use a variable and constant declaration in a computer program.
3.2.2.4	I can understand and know how to use assignment in a computer program.

🏁 Learning Objective Variables and assignment

Python Variables

A variable is a location in memory used to store some data (value).

They are given unique names to differentiate between different memory locations. The rules for writing a variable name is same as the rules for writing identifiers in Python.

We don't need to declare a variable before using it. In Python, we simply assign a value to a variable and it will exist. We don't even have to declare the type of the variable. This is handled internally according to the type of value we assign to the variable

Variable assignment - Assigning value to a Variable in Python

We use the assignment operator (=) to assign values to a variable. Any type of value can be assigned to any valid variable.

Assignment Example

a = 7
b = 3.14
c = "Hello World"

Click on the run button below to see the output of the python code assigning variables

See if you can improve the output of the code above?

Data types in Python

Every value in Python has a datatype. Since everything is an object in Python programming, data types are actually classes and variables are instance (object) of these classes.

There are various data types in Python. Some of the important types are listed below.

Python Numbers

Integers, floating point numbers and complex numbers falls under Python numbers category. They are defined as int, float and complex class in Python.

We can use the type() function to know which class a variable or a value belongs to.

Type Example

a = 7
print(a, "is of type", type(a))
b = 3.14
print(b, "is of type", type(b))
c = "Hello World"
print(c, "is of type", type(c))

Python Activity

Open up python IDLE and create a new file called variables

Declare three variables each of a different data type

Show what the data types are using the type() function

Try and add 3 variables together and print out the result

Click here if you need help ▶

Extension Activity Using Java

Click on the buttons below to see how variables and data types are used in Java

Java Tutorial Java Compiler

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Assessment