PROGRAMMING In Lesson 2

STARTER ACTIVITY Complete the starter activity in your python folder – lesson 2 Now we will see how you got on and update your self-assessment.

OBJECTIVES  Understand that languages have data types  Be able to use the idle editor to save programs  Understand if statement and indentation O UTCOMES  All-Level 4 Know the key data types discussed in lesson To be able to store a user input variable with help Write, save and run your first python program  Most-Level 5Be able to write a these with little help.  Some-Level 6Independently write these and adapt them

LETS RECAP LAST LESSON  What is a program? A program is a sequence of instructions that specifies how to perform a computation.  What is syntax? Refers to the spelling and grammar of a programming language  Variables – Boxes with numbers (or text) in.

PROGRAMS  We were not really writing programs last yesterday – they were statements. Programs are a sequence of many statements.  Lets write a program.  Open Idle (start menu, all programs, python 3.3)  Make sure you are in the editor.

MY FIRST REAL PORGRAM  Enter the following code print(“What is your name?") name = input() print(“Hello " + name)  Press F5, which runs the program. It will ask you to save it first - save the program into your lesson 2 folder call it hello

MY BETTER PROGRAM  See if you can adapt this to ask other questions.  Edit the program in the idle editor  Press f5 to run (and save it)  Write the number of other questions you asked into your self assessment book.

DATA TYPES – SAME AS IN DATABASES  Integer  Float  String “hello”“python”“4”“23.2”  Boolean TrueFalse  2 is NOT the same as 2.0 which is NOT the same as “2” Integer are whole numbers Float numbers have a decimal point Strings have start and end quotation marks Only has these 2 values

OUR FIRST GAME import random print("Hello! What is your name?") myName = input() number = random.randint(1, 10) print("Well, " + myName + ", I am thinking of a number between 1 and 10.") print("Take a guess.") guess = int(input()) if guess == number: print("Good job, " + myName + "! You guessed my number") Type this code into the idle editor Save it as “random one” Press f5 to run it Make sure you have 4 spaces here

LETS HAVE A LOOK AT THIS. import random print("Hello! What is your name?") myName = input() number = random.randint(1, 10) print("Well, " + myName + ", I am thinking of a number between 1 and 10.") print("Take a guess.") guess = int(input()) if guess == number: print("Good job, " + myName + "! You guessed my number") We re-using an existing piece of code to give us a random number Generates a random number between 1 and 10 and stores it in the variable number Converts the input from text to an integer The == is equal to

THE IF STATEMENT if guess == number: print("Good job, " + myName + "! You guessed my number") The print statement is run ONLY if the condition is True. Starts with if Guess == number the condition that evaluates to either True or False: is the end of the if statement. Notice the spaces. These are very important in python.

CONDITIONS Operator Sign Operator Name < Less than > Greater than <= Less than or equal to >= Greater than or equal to == Equal to != Not equal to 6 > 5 3 <= 4 2 == 3 4 = 5 45 != 2 3 == 3.0 Eggs > pizza True False Error, should be == True Error – remember data types Depends on the values of Eggs and pizza variables.

INDENTATION – 4 SPACES if 2 == 2: print("Good job, ") print (“you are good”) print (“Are we sure”) Which of these lines of code are run. yes if 24 == 87: print("Good job, ") print (“you are good”) print (“Are we sure”) Which of these lines of code are run. no yes Be very careful with spaces

CHALLENGES  Level 4 – Change the range of the random number to 1 to 20 Hint: change this statement number = random.randint(1, 10)  Level 5 - Display the random number if the user does not guess it Hint you might need this part of a statement if guess != number: This statement converts an integer type into a string type. number = str(number)  Level 6 - Let the user have 2 attempts to guess the number

PLENARY Update your self-evaluation for this lesson.

FUN TIME Try the tangram game Use left mouse button to drag, right mouse button clicks to turn tiles,