Python Introduction

Python

Quick Summary

Python is the #1 programming language in 2026 — used by Google, Netflix, NASA, Instagram, and Spotify. It reads like English, making it the easiest language to learn. This lesson covers your first Python program, variables, and basic output. By the end, you'll write code that actually runs.

Python is the world's most popular programming language. It's used by Google, Netflix, NASA, and Instagram.

Why Python?

Reads like English — easiest to learn
Used in: Web dev, Data Science, AI/ML, Automation
Huge community and free resources
Most asked language in Indian IT interviews

You can start coding Python right now at replit.com — no installation needed!

Example — PYTHON

# Your first Python program
print("Hello, World!")
# Variables
name = "Rahul"
age = 20
# String formatting
print(f"My name is {name}")
print(f"I am {age} years old")
# Simple math
price = 500
discount = price * 0.10
print(f"Discount: ₹{discount}")

Result

Hello, World!
My name is Rahul
I am 20 years old
Discount: ₹50.0

Key Takeaways

print() displays output to the screen
Variables store data — no need to declare types in Python
f-strings (f"...") are the modern way to format text with variables
Python is used in AI/ML, Web Dev, Data Science, Automation, and Game Dev
You can start coding Python instantly at replit.com — no installation needed

Real-World Usage

Instagram's backend is built with Python (Django). Google uses Python for YouTube's recommendation algorithm. Netflix uses Python for data analysis and content recommendations. NASA uses Python for scientific computing. If you learn Python, you're learning the language of the future.

NextPython If/Else

Interview Questions — Python Introduction

5 questions commonly asked in interviews

Q1 What is Python and why is it used? Beginner

Python is a high-level, interpreted programming language known for its simplicity and readability. It is used in web development, automation, data science, AI, and scripting.

Q2 What are the key features of Python? Beginner

Python is easy to learn, dynamically typed, interpreted, object-oriented, and has a large standard library with strong community support.

Q3 What is the difference between list and tuple in Python? Intermediate

Lists are mutable (can change), while tuples are immutable (cannot change). Lists use [] and tuples use ().

Q4 What is indentation in Python? Intermediate

Indentation is used to define blocks of code in Python. Unlike other languages, Python uses indentation instead of braces {}.

Q5 What are Python data types? Advanced

Common data types include int, float, string, list, tuple, set, and dictionary. Python automatically detects data types.

Frequently Asked Questions

Common doubts about Python Introduction

Yes, Python is considered one of the easiest programming languages due to its simple syntax and readability.

Python is used in web development, automation, machine learning, data analysis, scripting, and app development.

No, Python is beginner-friendly and does not require prior coding experience.

Yes, Python is open-source and completely free to use and distribute.

Yes, Python is widely used in industry and is in demand for roles like developer, data analyst, and AI engineer.

Test Your Knowledge

5 questions · Earn 50 XP

0 / 5

Q1 What type of language is Python?

Q2 Which symbol is used for comments in Python?

Q3 Which function is used to print output?

Q4 Which of these is a valid variable name?

Q5 Python is which type of typing system?

More on Python Introduction

Cheatsheet, tips, resources & what to learn next

Quick Cheatsheet

print(\"Hello World\")

Variable

$x = 10  # (Note: Python uses x = 10)

If Condition

if x > 5:
    print("Greater")

For Loop

for i in range(5):
    print(i)

List

my_list = [1, 2, 3]

Pro Tips

Always maintain proper indentation in Python — it defines code blocks.

Use meaningful variable names like user_name instead of x or y.

Practice daily by writing small scripts and solving problems.

Use print() frequently while learning to debug your code.

Resources

Python Official Docs Docs

W3Schools Python Tutorial Practice

Python Full Course (YouTube) Video

Up Next

Python Variables Python Conditions Python Loops