Introduction to Python

1
Introduction to Python

• Learning to Program

2
Computer Science

• Mathematics
• Engineering
• Science
• Craft
• Problem Solving

3
What is Python?

• Its a third generation language
• Its an interpreted language

?
Third Generation
?
Second Generation
?
First Generation
?
Hardware
4
What is IDLE?

• A rather basic text editor
• An IDE
• Integrated
• Development
• Environment
• New to LHS

Not installed by default
5
Our first program

• gtgtgt print(Hello World!)
• Interactive Mode gtgtgt
• Script Mode

6
What is a program then?

• Sequence of instructions
• Input
• Process
• Math
• Branches (Conditional execution)
• Loops (Repetition)
• Output

THATS ALL FOLKS
7
Whoops!

• Programming involves making lots of mistakes.
  These are called bugs.
• There are three types
• Syntax errors
• Runtime errors
• Semantic errors

8
Programming and Debugging are the same thing!

• Only superheroes can write more than a few lines
  of code without making a mistake.
• SO
• We write a tiny program, fix it, write a tiny
  bit more, fix that,
• .. and so on .
• .. forever

9
Our second program

• Using the IDLE editor
• Guess what!
• Print Hello World!
• Now save it and run it.

10
Homework

• Read through the first chapter of the book
• Install Python on your home computer .
• Complete Exercise 1.2