Introduction to Python Programming (CBSE Class 11 Computer Science)

Python is one of the most popular programming languages in the world. It is easy to learn, simple to read, and widely used in education, web development, artificial intelligence, data science, automation, and software development. Due to its simple syntax, CBSE has adopted Python as the programming language for Class 11 and Class 12 Computer Science.

Learning Objectives

• Understand Python programming.
• Learn the history of Python.
• Know the features of Python.
• Explore applications of Python.
• Write the first Python program.

---

What is Python?

Python is a high-level, interpreted, object-oriented, and general-purpose programming language. It enables programmers to write clear and readable code for developing a wide variety of applications.

---

History of Python

• Python was developed by Guido van Rossum.
• Development began in the late 1980s.
• The first official version was released in 1991.
• The name "Python" was inspired by the British comedy series Monty Python's Flying Circus.
• Python is maintained by the Python Software Foundation (PSF).

---

Features of Python

Feature	Description
Simple	Easy to learn and write.
Readable	Uses clear and understandable syntax.
Interpreted	Executed line by line without compilation.
Portable	Runs on Windows, Linux, and macOS.
Open Source	Available free of cost.
Object-Oriented	Supports classes and objects.
Extensible	Can work with C, C++, and other languages.
Large Standard Library	Provides many built-in modules.

---

Applications of Python

• Web Development
• Artificial Intelligence
• Machine Learning
• Data Science
• Automation and Scripting
• Game Development
• Desktop Applications
• Scientific Computing
• Cyber Security
• Internet of Things (IoT)

---

Why Learn Python?

• Simple syntax.
• Beginner-friendly.
• Large community support.
• High industry demand.
• Used by leading technology companies.

---

Installing Python

1. Download Python from the official Python website.
2. Run the installer.
3. Select "Add Python to PATH".
4. Click Install Now.
5. Verify the installation using the Python interpreter.

---

Your First Python Program

Program

print("Hello, World!")

---

Output

Hello, World!

---

Explanation

• print() is a built-in Python function.
• It displays the specified message on the screen.
• Text inside quotation marks is called a string.

---

Program Flow

Program Starts
      │
      ▼
Execute print()
      │
      ▼
Display Output
      │
      ▼
Program Ends

---

Think Like a Programmer

Input	Process	Output
No Input	Execute print() function	Hello, World!

---

Real-Life Example

Imagine introducing yourself to a new class. The first sentence you speak is similar to the first program a programmer writes. The print() function introduces your program by displaying a message on the screen.

---

Common Errors

• Misspelling print.
• Forgetting quotation marks around text.
• Using mismatched quotation marks.
• Missing parentheses.

---

Exam Tips

---

Frequently Asked Questions (FAQs)

1. Who developed Python?

Guido van Rossum.

2. Is Python a compiled language?

No. Python is an interpreted language.

3. Which function is used to display output?

The print() function.

4. Why is Python popular?

Because it is simple, readable, versatile, and widely used across industries.

5. Which organization maintains Python?

The Python Software Foundation (PSF).

---

Summary

• Python is a high-level, interpreted programming language.
• It was developed by Guido van Rossum.
• The first official release was in 1991.
• Python is widely used in web development, AI, data science, and automation.
• The print() function is used to display output.
• Python's simplicity and readability make it an excellent language for beginners.