1. Python SAT 1 Feedback

2. Entry Ticket: Calculating the areas

3. Learning Intentions Learning Intention
To review the first programming SAT
To develop an understanding of how to decompose problems into smaller sub problems
To develop an understanding of how to make code self-documenting
Learning Outcomes
Emerging
Write programs for sub-parts of a mathematical problem
Developing
Solve a mathematical problem using self-documenting code
Secure
Write programs that solve a variety of mathematical challenges using self- documenting code

4. Self-Documenting Code: The Mark Scheme
Criteria
Marks Available
Mark Descriptor
Marks to Award
Written code that is self-documenting, well-structured and modular in nature 3
Uses whitespace, functions, or comments to divide program into sensible sections
Uses comments to explain calculations
Uses comments to explain inputs and outputs 1
Used a consistent programming style throughout, including indentation and
the use of white space around operators and keywords
Consistent indentation
Consistent variable names (for example Hungarian notation)
Consistent programming structure

5. Top-down programming
There are 4 main principles to top-down programming:
Commenting
Self Identifying Variable Names
Indentation
Line Spacing

6. Commenting
This is one of the most useful things which you can put into code because it allows you to write a small explanation of the section of coding so if you are unsure what the section does it will then tell you for example :
Python coding for commenting = #

7. AgeVerify  bAgeVerify
Variable names
USE HUNGARIAN NOTATION:
Variable names which explain what they hold
New words should start with a capital
Start the variable name with the data type. E.g:
Age  iAge
Name  sName
Pi  fPi
AgeVerify  bAgeVerify

8. Indentation
Programs are rarely written as a list of instructions. Parts of the code are 'indented' TAB
Indentation
When there is code inside the constructor make sure to indent.
This allows you to see where if and else's are linked together as well as what code is in then if or the else statements.

9. Line spacing
Programs should be spaced out. One endless block of code making up a program is harder to read
Using line spacing you can make sure that all of section is there and is in the correct order because its like writing a piece of work without spaces in it. Example:
Hellotherethisisunreadable.
Hello there this is unreadable.

10. The problem
A gardener needs to buy some materials for a project they are working on. The garden is rectangular with a circular flower bed in the middle. The gardener always estimates based on whole numbers for the dimensions of the garden.
The gardener usually installs the same style of garden on most of their projects therefore the program in development should allow the gardener to input different sizes of lawn area and different sized flower beds.
The gardener charges £4.54 m2 of turf including top soil.
The gardener charges £6.75 m2 of flower bed including a mixture of flowers.
The gardener charges a standard 40% of the total price as labour.
When calculating his prices the gardener rounds each individual to the nearest penny.

11. Decomposing the problem
How do you solve this problem? What are the different components to this problem?

12. Calculating the Areas
Area of the Flower Bed: Formula: 3.14 x Radius2 Data Required: Radius Area of the Garden: Formula: Height x Width Data Required: Height, Width Area of the Turfed Area: Formula: Area of Garden – Area of Flower Bed Data Required: Area of Garden, Area of Flower Bed

13. Calculating the Costs Cost of Flower Bed:
Formula: 6.75 x Area of Flower Bed
Cost of Turf:
Formula: 4.54 x Area of Turf
Cost of Labour:
You need to add the two other costs together and then increase if by 40%
How would you do this?

14. Calculating the Labour Cost
To increase a value by 40% you can multiply it by 1.4 Cost of Labour: Formula: (Cost of Turf + Cost of Flower Bed) x 1.4

15. Have a go at programming the solution
Start off by getting the user to input the height and width of the garden, and radius of the flower bed.
Calculate the:
Area of the garden
Area of the Flowerbed
Area of the Turfed Area
Calculate the Cost of:
The Flowerbed
The Turf
The Labour
Total Cost
Output the:
Flowerbed Cost
Turf Cost
Labour Cost

16. Extension Challenges
Work through the following challenges – every time you complete one print off your code and output and stick it into your books.

17. PIN Number Challenges Thinking Tasks Programming Challenges
A personal identification number (PIN) is used at bank machines to allow you to take out your money.
How many digits are in a normal PIN?
How many different combinations could there be?
How long would it take a human to type them all in?
Why is it not possible for a human to do this?
Approximately how long would it take a computer to generate all the possible PIN numbers?
Write a program that prints all possible PIN numbers on the screen.
Write a program that asks for a PIN number, checks it, and only lets you in if it is correct.
Write a program that only lets you have three attempts at your PIN or the machine takes your bank card!

18. Strings and Things Thinking Time Programming Challenges
An anagram is a word that has had all the letters mixed up to make another word—how could a program do this?
How many ways can you jumble up the letters in a word?
Write a program that allows you to type in a sentence, which is printed in uppercase, lowercase, titlecase, capitalized, no spaces and swapped case.
Write a program that will count how many letters are in a sentence.
Write a program that allows you to type in your name with a mixture of upper and lower case, but it prints it out correctly.
Write a program that allows you to type in a word, which is then sorted into a random order!
Write a program that allows you to type in a sentence and it automatically removes all the vowels to turn it into text speak.

19. Thinking of a Number Thinking Time: Choose a random number
Programming Challenges
Can humans choose random numbers?
Can a computer choose a random number?
Find out who E.R.N.I.E. is ?
If you choose a number 1—1000 and tell the person higher or lower—how many guesses will they need?
How many guesses will you need to guess a number between 1— ?
Write a program that asks you to guess a number between 1— It tells you when you are correct and how many guesses you took.
Write a program where the computer guesses a number you have chosen, you can enter higher or lower until it gets it right. The computer should try to make the smallest number of guesses.

20. Guess the number Game!
I’ve used the code shown here to create a Guess the number game
Make the following improvements:
The program should tell the player whether their guess is Too High, or Too Low
When they guess correctly, the program should tell them how many guesses it took
Allow the player to choose the range of numbers to guess from