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INTRODUCTION TO PYTHON:
Python is a general-purpose interpreted, interactive, object-oriented, and high-level programming language.
It was created by Guido van Rossum during 1985- 1990.
Python got its name from “Monty Python’s flying circus”. Python was released in the year 2000.
v Python is interpreted: Python is processed at runtime by the interpreter. You do not need to compile your program before executing it.
v Python is Interactive: You can actually sit at a Python prompt and interact with the interpreter directly to write your programs.
v Python is Object-Oriented: Python supports Object-Oriented style or technique of programming that encapsulates code within objects.
v Python is a Beginner's Language: Python is a great language for the beginner- level programmers and supports the development of a wide range of applications.
v Easy-to-learn: Python is clearly defined and easily readable. The structure of the program is very simple. It uses few keywords.
v Easy-to-maintain: Python's source code is fairly easy-to-maintain.
v Portable: Python can run on a wide variety of hardware platforms and has the same interface on all platforms.
v Interpreted: Python is processed at runtime by the interpreter. So, there is no need to compile a program before executing it. You can simply run the program.
v Extensible: Programmers can embed python within their C,C++,Java script ,ActiveX, etc.
v Free and Open Source: Anyone can freely distribute it, read the source code, and edit it.
v High Level Language: When writing programs, programmers concentrate on solutions of the current problem, no need to worry about the low level details.
v Scalable: Python provides a better structure and support for large programs than shell scripting.
v Bit Torrent file sharing
v Google search engine, Youtube
v Intel, Cisco, HP, IBM
v Facebook, Drop box
Interpreter: To execute a program in a high-level language by translating it one line at a time.
Compiler: To translate a program written in a high-level language into a low-level language all at once, in preparation for later execution.
Python Interpreter is a program that reads and executes Python code. It uses 2 modes of Execution.
1. Interactive mode
2. Script mode
v Interactive Mode, as the name suggests, allows us to interact with OS.
v When we type Python statement, interpreter displays the result(s) immediately.
v Python, in interactive mode, is good enough to learn, experiment or explore.
v Working in interactive mode is convenient for beginners and for testing small pieces of code.
v We cannot save the statements and have to retype all the statements once again to re-run them.
In interactive mode, you type Python programs and the interpreter displays the result:
>>> 1 + 1
The chevron, >>>, is the prompt the interpreter uses to indicate that it is ready for you to enter code. If you type 1 + 1, the interpreter replies 2.
>>> print ('Hello, World!')
This is an example of a print statement. It displays a result on the screen. In this case, the result is the words.
v In script mode, we type python program in a file and then use interpreter to execute the content of the file.
v Scripts can be saved to disk for future use. Python scripts have the extension .py, meaning that the filename ends with .py
v Save the code with filename.py and run the interpreter in script mode to execute the script.
v Is a graphical user interface which is completely written in Python.
v It is bundled with the default implementation of the python language and also comes with optional part of the Python packaging.
Features of IDLE:
Multi-window text editor with syntax highlighting.
v Auto completion with smart indentation.
Python shell to display output with syntax highlighting.
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