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PROGRAMMING In. STARTER Using the internet…Find … what does case sensitive mean what a programming language is.. 3 benefits of Python.

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Presentation on theme: "PROGRAMMING In. STARTER Using the internet…Find … what does case sensitive mean what a programming language is.. 3 benefits of Python."— Presentation transcript:

1 PROGRAMMING In

2 STARTER Using the internet…Find … what does case sensitive mean what a programming language is.. 3 benefits of Python

3 OBJECTIVES Learn about python as a programming language Learn about expressions & variables and their use Create several successful programs

4 Open the ICT levels spread sheet and find python tab Read each Yellow box and answer in the white box. S ELF A SSESSMENT

5 TARGETS. Open the self evaluation workbook and fill in the boxes in green ellipse (squashed circle) This workbook will be used throughout the python unit – DO NOT LOSE IT. It will be used at the end by the teacher to assess your ICT Level.

6 PYTHON Python is a programming language A set of words and rules for instructing a computer to perform specific tasks.computer The term programming language usually refers to high-level languages, such as BASIC, C, C++, Python etchigh-level languagesBASICCC++ Each Programming language has a set of keywords and a special syntax for writing program instructions.Programming languagekeywordssyntaxprograminstructions

7 Learning to program is going to be fun – so lets keep it simple. org 100h main proc mov ah,9 ; mov dx,offset hello_message int 21h : retn hello_message db 'Hello, world!$' main endp end main print ("Hello, World!) #include int main() { std::cout << "Hello World!" << std::endl; return 0; } C++ Assembler python WHY PYTHON

8 WHAT IS A PROGRAM Programming is not telling the computer what you want to do….it is telling it EXACTLY HOW to do it. A program is a sequence of instructions that specifies how to perform a computation. The computation might be something mathematical, such as solving a system of equations It can also be a symbolic computation, such as searching and replacing text in a document or moving a graphic icon (sprite) on a game.

9 TRADITION It is tradition that the first program everyone creates is to say Hello world. From the start menu – all programs / python 3.3 / idle Open Idle(python GUI) MAKE SURE YOU ARE IN THE PYTHON SHELL Enter the following and press enter print (Hello, World) This one If you see this window on top – look for the python shell window.

10 EXPRESSIONS Try typing some of these expression in idle, pressing return after each one print ( ) print (8*6) print (10-5+6) print ( 2 + 2) Remember to press F5 to save the program first otherwise it wont run.

11 EXPRESSIONS You have been using expressions 2 values and an operator Even the follows this rule Operators, you already know. Perhaps the multiplication is written differently as a * (on the number pad) At the moment python is acting like a calculator. 2+2 addition 2-2 subtraction 2*2 multiplication 2/2 division

12 SYNTAX In computer science, the syntax of a programming language is the set of rules that define the combinations of symbols that are considered to be correctly structured programs in that language.computer scienceprogramming languageprograms Aka syntax means that special key words and characters combine to result in a program.

13 SYNTAX The syntax of a programming language is the set of rules that control if a program is correct.programming language You tried print (Hello, World) and it worked – a correct program. Try these print hello print (hello) PRINT(hello) print (a + b) print (5 + 6 / 7 +) Syntax is CRITICAL in programming. A computer cannot take an educated guess at your instructions. Computers just follow exactly what you tell them to do.

14 VARIABLES A variable is just a box with a number in it. When we use variable in our code the computer uses the value in the variable. To store the value 15 in the variable and display it spam = 15 print (spam) Try it. Now try these spam = spam + 12 print (spam) spam = spam + spam print (spam) spam = spam * spam print (spam)

15 VARIABLES This time we have 2 variables eggs and fizz You can assign them by eggs = 15 fizz = 10 What be the output of the following, go on try it. print( eggs ) print( eggs + fizz ) spam = eggs + fizz print( spam ) eggs = fizz print( eggs ) print( EGGS ) >>>nothing 25 >>>nothing 10 Traceback (most recent call last): File " ", line 1, in EGGS NameError: name 'EGGS' is not defined In python eggs is not the same as EGGS. Python is case sensitive which means YOU MUST BE CAREFUL

16 COMPLETE SELF ASSESSMENT QUIZ Complete Self Assessment quiz from lesson 1

17 CHALLENGE TIME Create a program to calculate the perimeter and area of: 1.A Square 2.A Rectangle 3.A Triangle 4.A Circle Can you create a program that asks the user to input the length and width and then the program calculates the perimeter and area for them.

18 PLENARY And update your self-evaluation for this lesson.


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