Basic Concepts

What is Python?

1.Welcome to Python!

Python is a high-level programming language,with applicationgs in numerous areas,including web programming,scripting,scientific computing,adn artificial intelligence.It is very ppular and used by organizations such as Google,NASA,the CIA,and Disney.

Python is processed at runtime by the interpreter(a program that runs scripts written in an interpreted language such as Python.There is no need to compile your program before executing it.

Python is a:

  set of editing tools

  development environment

  Programming language

The three major versions of Python are 1.x,2.x and 3.x.These are subdivided into minor versions,such as 2.7 and 3.3.

Code written for Python 3.x is guaranteed to work in all future versions.

Both Python Versiong 2.x and 3.x are used currently.

This course cobers Python 3.x,but it isn't hard to change from one version to another.

Python has several different implementations,written in various languages.

The version used in this course,CPython,is the most popular by far.

Which of these statements is true?

  Python code must be always compiled

CPython is an implementation if Python

Python 1.7 is the most widely used version

Your First Program

Let's start off by creating a short program that displays "Hello world!".

In Python,wo use the print statement to output text:

 1 print('Hello world!')

2 Hello world! 

Congratulations!You have written your first program.

 Run,save,and share your Python code on our Code Playground without installing any additional software.When using a computer,you will need to download and install Python from www.python.org.

Note the >>>in the code above.They are the prompt symbol of the Python console.Python is an interpreted language,which means that each line is executed as it is entered.Python also includes IDLE,the integrated development environment,which includes tools for writing and debugging entire programs.