NCERT Class 11 Informatics Practices Informatics Practices: Chapter 3 — Brief Overview of Python
This chapter provides a comprehensive introduction to the Python programming language, a popular and easy-to-learn tool created by Guido van Rossum. It covers the fundamental concepts necessary for beginners, including what a program and a programming language are, with Python highlighted as a key example. The chapter details how to work with Python, emphasizing the need for an interpreter and introducing the Python prompt. It explains the two primary execution modes: interactive mode, suitable for testing single lines of code, and script mode, for writing and saving complete programs. Key elements like Python keywords, identifiers, variables, data types, operators, expressions, input/output operations, debugging, functions, and control flow statements (if-else, for loops, nested loops) are introduced. This chapter serves as a foundational guide for students to begin their journey in Python programming within the CBSE curriculum.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 11 |
| Subject | Informatics Practices |
| Book | Informatics Practices |
| Chapter | Chapter 3 — Brief Overview of Python |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 388 |
Learning outcomes
- Understand the concept of a program and programming language.
- Identify Python as a popular and versatile programming language.
- Learn how to install and work with the Python interpreter.
- Differentiate between interactive and script modes of execution.
- Recognize basic Python syntax elements like keywords, identifiers, and variables.
- Understand fundamental data types and operators in Python.
Vocabulary
| Word | Meaning |
|---|---|
| Program | An ordered set of instructions or commands to be executed by a computer. |
| Programming Language | A language used to specify instructions for a computer. |
| Python | A popular, easy-to-learn programming language created by Guido van Rossum. |
| Interpreter | A program that translates and executes source code line by line; also called Python shell. |
| Python Prompt | The symbol (>>>) indicating that the Python interpreter is ready to receive instructions. |
| Interactive Mode | A mode where Python statements are typed directly at the prompt for immediate execution. |
| Script Mode | A mode where Python statements are written in a file and then executed. |
| Keywords | Reserved words in Python that have special meanings. |
| Identifiers | Names given to entities like variables, functions, etc. |
| Variables | Named storage locations that hold data values. |
| Data Types | Categories of data that define the type of value a variable can hold (e.g., integer, float, string). |
| Operators | Symbols that perform operations on operands (e.g., +, -, *, /). |
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Practice questions
- What is a program? Answer: A program is an ordered set of instructions or commands to be executed by a computer.
- Who created Python and when? Answer: Python was created by Guido van Rossum in 1991.
- What is the symbol that indicates the Python interpreter is ready? Answer: The symbol is the Python prompt (>>>).
- What are the two ways to run a program using the Python interpreter? Answer: The two ways are interactive mode and script mode.
- When is interactive mode convenient? Answer: Interactive mode is convenient for testing a single line of code for instant execution.
Practice MCQs
Q1. What is an ordered set of instructions or commands to be executed by a computer called?
Explanation: A program is defined as an ordered set of instructions or commands that a computer executes.
Q2. Who is credited with creating the Python programming language?
Explanation: Guido van Rossum created Python in 1991.
Q3. What is the symbol that indicates the Python interpreter is ready to receive instructions?
Explanation: The symbol '>>>' is known as the Python prompt, signaling that the interpreter is ready for input.
Q4. Which mode is convenient for testing single lines of code for instant execution?
Explanation: Interactive mode allows users to type and execute Python statements directly at the prompt, making it ideal for quick testing.
Q5. Where can the latest version of Python be downloaded?
Explanation: The official website for downloading Python and its related resources is https://www.python.org/.
Frequently asked questions
What is Python?
Python is a popular, high-level, and easy-to-learn programming language created by Guido van Rossum in 1991, used in various fields like software development and AI.
What is the difference between interactive mode and script mode in Python?
In interactive mode, you type commands directly at the prompt for immediate execution. In script mode, you write code in a file and then execute the entire file.
What is a Python prompt?
The Python prompt, typically shown as '>>>', indicates that the Python interpreter is ready to accept commands or statements.
Where can I download Python?
You can download the latest version of Python from its official website: https://www.python.org/.
What is an interpreter in the context of Python?
A Python interpreter (also called a Python shell) is a program that translates and executes Python code. It needs to be installed on your computer or you can use an online version.
Why is Python popular?
Python is popular due to its readability, ease of learning, extensive libraries, and versatility across different domains like web development, data science, and automation.
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NCERT Class 11 Informatics Practices — Informatics Practices — Chapter 3 — Brief Overview of Python. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.