NCERT Book Class 11 Informative Practices Brief Overview of Python

Informatics Practices
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Chapter 03 Brief Overview of Python PDF Resource

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3.1 INTRODUCTION TO PYTHON

 
An ordered set of instructions or commands to be executed by a computer is called a program. The language used to specify those set of instructions to the computer is called a programming language for example Python, C, C++, Java, etc.
This chapter gives a brief overview of Python programming language. Python is a very popular and easy to learn programming language, created by Guido van Rossum in 1991. It is used in a variety of fields, including software development, web development, scientific computing, big data and Artificial Intelligence. The programs given in this book are written using Python 3.7.0. However, one can install any version of Python 3 to follow the programs given.
 
3.1.1 Working with Python
To write and run (execute) a Python program, we need to have a Python interpreter installed on our computer or we can use any online Python interpreter. The interpreter is also called Python shell. A sample screen of Python interpreter is shown in Figure 3.1. Here, the symbol >>> is called Python prompt, which indicates that the interpreter is ready to receive instructions.
We can type commands or statements on this prompt for execution.

NCERT Class 11 Informative Practices Brief Overview of Python


3.1.2 Execution Modes
There are two ways to run a program using the Python interpreter:
a) Interactive mode
b) Script mode
(A) Interactive Mode
In the interactive mode, we can type a Python statement on the >>> prompt directly. As soon as we press enter, the interpreter executes the statement and displays the result(s), as shown in Figure 3.2.
Working in the interactive mode is convenient for testing a single line code for instant execution. But in the interactive mode, we cannot save the statements for

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