INTRODUCTION TO PYTHON

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Python is a high-level, interpreted, general-purpose, dynamic programming language. Python possesses a property of code termed reusability. The syntax of python programs can express concepts in fewer lines as compared to programs in C, C++ and JAVA.

 Python can be used in multiple programming styles, including Object-Oriented, Functional programming, Procedural Programming and Imperative styles. It also supports automatic memory management and has a large standard library and innumerous set of third party libraries. Python can be used on almost every operating system because its interpreter is available for many operating systems. It is a free and open- source software(Open-source software is a kind of computer software in which the source code of the software is made public, i.e., the copyright holder gives rights to everyone to read, change and distribute the code for any purpose).

KEY FEATURES OF PYTHON

·         The code written in Python is automatically compiled to byte code and executed.

·         Python can be used as a scripting language, as a language for implementing web applications, etc.

·         Extending Python with C or C++ can help in the performance of intensive tasks where speed of execution is a key criterion.

·         Python supports many features such as nested code blocks, functions, classes, modules and packages.

·         Python makes use of an object-oriented programming approach.

·         It has many built-in datatypes: strings, lists, tuples, dictionaries, etc.

·         It supports many control statements such as if, if-else, if-elif-else, while, iterative, for, etc.

·         It allows for easier programming with the use of functions, classes, modules and packages.

IDLE

IDLE is Python’s Integrated Development and Learning Environment. It has the following features:

·         Coded in 100% pure Python, using the tKinter GUI toolkit.

·         Cross-platform: Works mostly the same on Windows, Unix, and MacOS.

·         Python shell window (interactive interpreter) with colorizing of code input, output, and error messages.

·         It is a multi-window text editor with multiple undo, Python Colorizing, smart indent, call tips, auto completion, and other features.

·         Search within any window, replace within editor windows, and search through multiple files.

·         Debugger with persistent breakpoints, stepping, and viewing of global and local namespaces.

·         Configuration, browsers, and other dialogs.

IDLE has two main window types, the Shell window and the Editor windows. It is possible to have multiple editor windows simultaneously. On windows and Linux, each has its own top menu.

PYTHON INTERPRETER

An interpreter is a program that reads and executes code. This includes source code, pre-compiled code, and scripts. It converts a high-level programming language into machine code. Unlike a compiler that simply converts the source code to machine code, an interpreter can be run directly as an executable program.

Python is referred to as an interpreted language. This means that each line of code is executed one by one. The reason why Python is termed as a n interpreted language is that the compiler in Python does relatively less work than an interpreter or in a compiled language like C.

WRITING AND EXECUTING PYTHON SCRIPTS

First of all download the Python Installer from the link:

http://www.Python.org/downloads/

The different ways in which we can we can run a Python script are:

1.      Interactive Mode

2.      Command Line

3.      Text Editor

4.      IDE (Integrated Development Environment)

Interactive Mode

In this mode you can run your script line by line in a sequence. To enter in an interactive mode you will have to open Command Prompt on tour windows machine and type ‘python’ and press Enter.

>>> print(‘Hello World’)

Hello World

 >>> 2 + 5

  7

  >>> print(‘This is a Python Script’)

 This is a Python Script
 

 

 

 

 



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