1. Lesson 1 - Sequencing

2. What is Python?
Python is a programming language that is often used to develop web applications.
The creator of Python, Guido van Rossum named the language after the 1970s BBC Comedy series ‘Monty Python’s Flying Circus’.

3. What is a Program?
The most simple type of program uses sequencing, a set of instructions carried out one after another.
Start
Display “Computer”
Display “Science”
Display “Rocks”
End

4. Flowcharts are used to plan programs before they are created.
The start or end of the program. There may be more than one way to complete the algorithm and there may be more than one end box.
A process, that is doing something for example calculating something.
An input or output, for example:
Input num1
A decision, YES or NO, or a choice of paths, for example:
Is it a weekday?
A subroutine or self-contained program that can be used as required.
When a flowchart will not fit onto a single page we use this shape to show how the sections of the flowchart connect together.

5. “What’s your name?” Strings
In programming we usually call normal text a string.
“What’s your name?”
A string is a collection of alphabetic and/or numeric characters.
We tell the computer something is a string by putting quote marks around it.

6. Here is another example of a program using sequencing.
Start
It is important to know there is usually more than one correct solution to a program.
Boil kettle
Add tea bag
Add hot water
Add milk
End

7. Sequencing print (“World”) print (“Hello”)
Below is the python code to the program shown in the flowchart.
Start
print (“World”)
Display “Hello”
print (“Hello”)
Display “World”
End
Spot the error
The code is in the wrong order.

8. Match the Python code to the correct part of the flowchart.
Sequencing
Match the Python code to the correct part of the flowchart.
Start
Display “Computer”
print(“Computer)
Display “Science”
prit(“Science”)
Display “Rocks”
print“Rocks”)
Spot the 3 errors
End
The code must be exact.

9. Demonstration – First Python Program
Your teacher will now walk you through your first Python program
Start
Display “Hello”
print (“Hello”)
End
Create a folder on your personal drive (H:) called Python.
Press F5 and save your program as hello in your Python folder.

10. Second Python Program
Start / Computer / ICT (I:) / Python / IDLE
Open the Python IDLE. Start a new program by clicking on File > New File.
REMEMBER: To start a new program click on File > New File.
Enter the code.
print(“Computer)
Correct the mistakes.
prit(“Science”)
print“Rocks”)
Press F5 and save your program as computer in your Python folder.

11. Third Python Program
Now write a program to print out your full name.
REMEMBER: To start a new program click on File > New File.
Use your previous programs to help you,
Save your program as name and press F5 to run it.

12. Video Watch this short clip about coding:
Link:

13. Variables
When programming it is often necessary to store a value for use later on in the program.
A variable is a label given to a location in memory containing a value that can be accessed or changed.
Think of a variable as a box with a label that you can store information in.
Name

14. Type the Python code below and press F5 to run.
Variables Example 1
Type the Python code below and press F5 to run.
Start
Input Name
Display “Hello “ + name
End
Create a Python program based on the code above and save it as variables1. Press F5 to run it.

15. Variables Example 2
Type the Python code below and press F5 to run.
We use int to tell Python we are going to enter an integer (whole number). We use float when working with decimal places.
Start
Input Age
age = int(input(“How old are you? ”))
print (“You are ” + str(age) + “ years old.”)
Display “You are “ + age
We use str to convert a number into a string.
End
Create a Python program based on the code above and save it as variables2. Press F5 to run it.

16. Variables Challenge
Use the previous examples to help you.
Create a program that outputs the following, making use of three variables:
My name is name, I am age years old and I go to school.
name = input(“Wh…
age = int(input(“How…
school = input(“Wh…
print(“My name is ” + name + “and my age is” + str(age)…
HELP
Save it as variables3. Press F5 to run it.

17. Variables Challenge Solution
name = input(“What is your name? ”)
age = int(input(“How old are you?”))
school = input(“What school do you go to?”)
print(“My name is ” + name + “ , my age is” + str(age) + “ and I go to ” + school + “ school.”)

18. Variables Extension Add a question about your favourite subject
Add extra information to your program, for example:
Add a question about your favourite subject
Add a question about extra curricular clubs
Add more school related questions!

19. Python Where do you find Python? How do you start a new program?
Start / Computer / ICT (I:) / Python / IDLE
In Python go to:
File / New File
How do you run a program?
Where do you save your programs?
Press the F5 key (on the top row)
In the Python folder you have created in you personal area (H:)