Week 3

Python the Number Wizard

Aim: Use Python's maths operators to solve calculations and store the results.

New coding words

operator
calculation
integer
result
expression

What the coding words mean

operator: A symbol that tells Python which maths action to perform, such as +, -, * or /.
calculation: Using numbers and operators to work out an answer.
integer: A whole number without a decimal point, such as 12.
result: The answer produced by a calculation.
expression: A piece of code that Python can calculate, such as 5 + 3.

Code along

Calculate with Python

Use Python's maths operators to calculate and display four answers.

Your Python code.py

Tab indents. Esc then Tab leaves the editor. Ctrl/⌘ + Enter runs your code.

Output (Shell)What your program does

Select Run my code to try this program.

Opening your coding space…Each activity has its own saved code.

Mini project

Space Mission Calculator

Calculate supplies for a pretend journey to the Moon.

Your Python code.py

Tab indents. Esc then Tab leaves the editor. Ctrl/⌘ + Enter runs your code.

Output (Shell)What your program does

Select Run my code to try this program.

Opening your coding space…Each activity has its own saved code.

Your mini-project to-do list

0 of 4 completed

Complete these activities in the mini-project editor above. After each change, select Run my code to check your program’s output or drawing.

Level 1: Change the number of astronauts.Level 2: Make the mission last seven days.Level 3: Add a calculation for two oxygen tanks per astronaut.

Save your finished mini project

Select Download my work and save the file as week_3_space_mission_calculator.py. The .py ending tells us that the file contains Python code. Keep this file as a copy of your finished program.

Debugging detective

In your mini-project code: Replace one * with +. Does the answer still match the story? This is a logic bug: the code runs, but the answer is wrong. Select Run my code after each change to check your program’s output or drawing.

Knowledge check

Question 1

Which symbol means divide in Python?

/*

Question 2

Write Python code to find the cost of three toys at 4 pounds each.

Your Python code

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How are you getting on so far?

My checklist

Finished Week 3?

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