Embedded Files
Techniques
Techniques
Sequence Loops Selection (IF ELIF ELSE) Handling Strings Random Lists Reading and writing files
Procedures and Functions
Sequence (Programming Construct)
Sequence (Programming Construct)
Order of steps in a algorithm. The next step will not start until the previous step has completed.
Flowchart
Flowchart
Pseudocode
Pseudocode
Python Code
Python Code
Selection (Programming Construct)
Selection (Programming Construct)
Instructions performed are determined by the outcome of a condition ( age < 18 ... is an example of a condition)
Functions
Functions
Learning Objectives - To know how to create a simple function ... so that you can create sub programs to perform different tasks
Learning Objectives - To know how to create a simple function ... so that you can create sub programs to perform different tasks
1] Watch this video to learn how to create a simple function that adds 2 numbers together. The function returns the result of the addition...... WATCH / PAUSE / DO
1] Watch this video to learn how to create a simple function that adds 2 numbers together. The function returns the result of the addition...... WATCH / PAUSE / DO
2] Watch this video to learn how to create a function that finds the area of a square. The function returns the area..... WATCH / PAUSE / DO
2] Watch this video to learn how to create a function that finds the area of a square. The function returns the area..... WATCH / PAUSE / DO
3] Watch this video to learn how to create a function that finds out if a particular number is odd or even. The function returns 'Odd' or 'Even' ..... WATCH / PAUSE / DO
3] Watch this video to learn how to create a function that finds out if a particular number is odd or even. The function returns 'Odd' or 'Even' ..... WATCH / PAUSE / DO
4] Watch this video to learn how to create a function that generates a school email address. The function returns an email address based on a students name and when they started in yr 7...... WATCH / PAUSE / DO
4] Watch this video to learn how to create a function that generates a school email address. The function returns an email address based on a students name and when they started in yr 7...... WATCH / PAUSE / DO
Tasks
Tasks
a] Can you create a function that returns the volume of a cube. ...... volume = length * length * length .... save this program as VolumeOfCube_function
a] Can you create a function that returns the volume of a cube. ...... volume = length * length * length .... save this program as VolumeOfCube_function
b] Can you create a function that returns the area of a circle ...... area = 3.14 * ( radius * radius ) .... save this program as AreaOfCircle_function
b] Can you create a function that returns the area of a circle ...... area = 3.14 * ( radius * radius ) .... save this program as AreaOfCircle_function
c] Can you create a function that returns 'valid' or 'invalid' depending on the length of a password. A password must be at least 8 characters long for it to be valid. Use len( ) to find out how many characters are in a string ....... save this program as PasswordLength_function
c] Can you create a function that returns 'valid' or 'invalid' depending on the length of a password. A password must be at least 8 characters long for it to be valid. Use len( ) to find out how many characters are in a string ....... save this program as PasswordLength_function
Flowchart
Flowchart
Pseudocode
Pseudocode
Python Code
Python Code
Iteration (Programming Construct)
Iteration (Programming Construct)
Instructions can be repeated until a set condition has been met. (password == 'letmein' ... is an example of a condition)
Flowchart
Flowchart
Pseudocode
Pseudocode
Python Code
Python Code
Car Number Plate Generator
Car Number Plate Generator
Learning Objectives
Learning Objectives
To know how to generate a car number plate based on the user input
To know how to generate a car number plate based on the user input
Skills Covered
Skills Covered
How to create a list ... How to extract and store letters / numbers from a string
How to create a list ... How to extract and store letters / numbers from a string
1] Create a new folder called Car Number Plate Generator inside your Python folder.
2] Open Thonny ... Save the blank file as Car Number Plate Generator inside the folder you just created.
3] Video 1
4] Video 2
5] Video 3
6] Video 4
Challenge 1 - Can you add brief comments to each line of code to explain what is going on? ... Use the # to add comments
Challenge 2 - Can you create a program that generates a National Insurance Number? Click here to see what they are.
e.g. National Insurance Number - FD 12 43 98 C
Hint - You will need to create variables to store random letters and numbers - re-use some of the code from the number plate generator program
e.g. Variable 1 - To store the first random letter ... Variable 2 to store the second random letter ... Variable 3 to store the first random number ... etc
Challenge 3 - Can you add validation to the input. For example, what if someone enters 1 letter for the county in the number plate generator program?
Or what if someone enters 17 for the car year, when they should enter 2017?
Can you think of where else you can validate the user’s input?
Number Guessing Game
Number Guessing Game
Learning Objectives
Learning Objectives
To know how to combine ITERATION (count controlled loop and condition controlled loop) and SELECTION (if) to create a working game.
To know how to combine ITERATION (count controlled loop and condition controlled loop) and SELECTION (if) to create a working game.
Skills Covered
Skills Covered
How to create a count controlled loop so that the user can play 3 rounds
How to create a count controlled loop so that the user can play 3 rounds
How to create a condition controlled loop so that the user can guess the number 6 times
How to create a condition controlled loop so that the user can guess the number 6 times
How to create another condition controlled loop so that the user's input is validated to only accept a number between 1 and 20
How to create another condition controlled loop so that the user's input is validated to only accept a number between 1 and 20
1] Create a new folder called Number Guessing Game inside your Python folder. (if you already have a folder called this ... then just name the folder as Number Guessing Game 2)
2] Open Thonny ... Save the blank file as Number Guessing Game inside the folder you just created. (if you already have a file called this ... then just name the file as Number Guessing Game 2)
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You can open the following videos from the school network if you prefer ... remember to open them in Windows Media Player not Quicktime.
Resources > subjects > Computer Science > Year 9, 10, 11 > GCSE 9-1 > Programming Techniques > Number Guessing Game using both loops
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3] Video 1
4] Video 2
5] Video 3
6] Video 4
Challenge 1 - Can you add brief comments to each line of code to explain what is going on? ... Use the # to add comments
Challenge 2 - Can you create a variable that stores the total number of guesses throughout all 3 rounds
Challenge 3 - Can you get the program to display your accuracy as a percentage for each round?
WRITING data to a text file and READING data from a text file
WRITING data to a text file and READING data from a text file
Learning Objectives -
Learning Objectives -
To know how to write data to a text file ... so that you can permanently store data
To know how to write data to a text file ... so that you can permanently store data
To know how to read data from a text file ... so that you can display stored data
To know how to read data from a text file ... so that you can display stored data
You will be making a simple mobile phone contacts program
You will be making a simple mobile phone contacts program
1] Watch this video to learn the structure of WRITING to a text file
1] Watch this video to learn the structure of WRITING to a text file
2] Watch this video to learn how to create a new text file ...... WATCH / PAUSE / DO
2] Watch this video to learn how to create a new text file ...... WATCH / PAUSE / DO
3] Watch this video to learn how to WRITE data to the text file ...... WATCH / PAUSE / DO
3] Watch this video to learn how to WRITE data to the text file ...... WATCH / PAUSE / DO
4] Watch this video to learn the structure of READING from a text file
4] Watch this video to learn the structure of READING from a text file
5] Watch this video to learn how to READ data from the text file ...... WATCH / PAUSE / DO
5] Watch this video to learn how to READ data from the text file ...... WATCH / PAUSE / DO
Tasks
Tasks
a] Can you add validation to the name variable so that the user cannot enter a name that is less than 2 letters long?
a] Can you add validation to the name variable so that the user cannot enter a name that is less than 2 letters long?
Hint ... use LEN ( ) to find the length of a string ... use a WHILE LOOP
b] Can you add validation to the number variable so that the mobile number is exactly 11 numbers long
b] Can you add validation to the number variable so that the mobile number is exactly 11 numbers long
Hint ... use LEN ( ) to find the length of a string ... use a WHILE LOOP
c] Can you create a count controlled loop so that the program keeps asking you to enter new contacts 5 times
c] Can you create a count controlled loop so that the program keeps asking you to enter new contacts 5 times
Mile to Km Converter using PROCEDURES
Mile to Km Converter using PROCEDURES
Learning Objectives
Learning Objectives
To know how to convert miles to kilometres and kilometres to miles
To know how to convert miles to kilometres and kilometres to miles
Skills Covered
Skills Covered
How to create a procedure to organise and structure your code ... How to use a condition controlled loop to validate the user's input
How to create a procedure to organise and structure your code ... How to use a condition controlled loop to validate the user's input
1] Create a new folder called Conversion Program using Procedures inside your Python folder.
2] Open Thonny ... Save the blank file as Conversion Program using Procedures inside the folder you just created.
3] Video 1 ... WATCH / PAUSE / DO
4] Video 2 ... WATCH / PAUSE / DO
Challenge - Can you add an extra procedure that converts cm to inches and inches to cm? ... you will need to add extra options to the menu (e.g. Press 3 to convert CM to Inches ... Press 4 to convert Inches to CM ... you will also need to add the numbers 3 and 4 to the list of valid choices.
There are 0.39 inches in 1 cm
Binary to Denary Program using LOOPS and a LIST
Binary to Denary Program using LOOPS and a LIST
Learning Objectives
Learning Objectives
To know how to convert a binary number into a denary number
To know how to convert a binary number into a denary number
To know why it is more efficient to use a loop to avoid repetitive code
To know why it is more efficient to use a loop to avoid repetitive code
Skills Covered
Skills Covered
How to get an index of a string / How to Loop through an array (list)
How to get an index of a string / How to Loop through an array (list)
1] Open Thonny ... Save the blank file as Binary to Denary Program 1 inside your Python folder.
2] Video 1 ... WATCH / PAUSE / DO ... You will learn how to convert a binary number into a denary number
3] Video 2 ... WATCH / PAUSE / DO ... You will learn how to use a FOR LOOP to make your program run efficiently by executing fewer lines of code
Challenge 1 - Can you validate the INPUT so that only a binary number of 8 characters can be entered?
Challenge 2 - Can you validate the INPUT so that letters cannot be entered? HINT
Challenge 3 - Can you create a FUNCTION so that you pass in the binary number to the function, and it returns the denary number?
Denary to Binary Program using LOOPS and a LIST
Denary to Binary Program using LOOPS and a LIST
Learning Objectives
Learning Objectives
To know how to convert a denary number into a binary number
To know how to convert a denary number into a binary number
To know why it is more efficient to use a loop to avoid repetitive code
To know why it is more efficient to use a loop to avoid repetitive code
Skills Covered
Skills Covered
How to Loop through an array (list)
How to Loop through an array (list)
1] Open Thonny ... Save the blank file as Denary to Binary Program 1 inside your Python folder.
2] Video 1 ... WATCH / PAUSE / DO ... You will learn how to convert a denary number into a binary number
3] Video 2 ... WATCH / PAUSE / DO ... You will learn how to use a FOR LOOP to make your program run efficiently by executing fewer lines of code
Challenge 1 - Can you validate the INPUT so that only a number between 0 and 255 can be entered?
Challenge 2 - Can you validate the INPUT so that letters cannot be entered? HINT
Challenge 3 - Can you create a FUNCTION so that you pass in the denary number to the function, and it returns the binary number?
ULTIMATE CHALLENGE - Can you create a menu system so that if you enter 1 ... it will convert a binary number into a denary number ... and if you enter 2 ... it will convert a denary number into binary number? - You will be a coding god/goddess if you can do this :)
Algorithms
Algorithms
Writing data to a text file (Advanced)
Writing data to a text file (Advanced)
Learning Objectives
To learn how to write data to a text file in Python.
Click on this link to access the videos you will need for this lesson. The videos can also be found in ...
resources > subjects > Computer Science > Year 9, 10, 11 > GCSE 9-1 > Programming Techniques > File Handling > Writing to a text fileThe videos go through the basics of writing data to a text file. The videos also explain how to answer a typical GCSE pseudocode question that uses FUNCTIONS.
1] Watch video 1 - This explains the Pseudocode for writing to text files - watch this fully
2] Video 2 - 5 will show you how to write data to a text file and create a function. Follow the video carefully and do the skills (e.g. Creating a folder / Creating a text file / Coding in Thonny) ... watch / pause / do
Extra Task (You must watch the videos 1 - 5 and carried out the skills, before approaching this task)
Can you create a function that creates new computer usernames
1] The function will need to take as INPUT ... the student's firstname ... the student's lastname ... the year the student started in Year 7
2] The function will need to create a username that could look like the following ... 12simpshom ... assuming that the name was Homer Simpson and started Year 7 in 2012.
3] The program must then write the new username to a text file called newusernames.txt
Extension
Can you make the program ask the user to enter 10 new usernames and each time a username has been created it adds it to the text file?
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