Python Programming! Variables and Data Types | Lectures 2

Lets Start Python Programming For Beginners. Variables and Data Types, Lectures 2

🐍 Variables and Data Types

🎯 Goal

By the end of this lecture, you will:

• Understand what a variable is.
• Know how to store different types of data (numbers, words, yes/no).
• Be able to print and use variables in simple code.

🧠 What is a Variable?

A variable is like a labeled box where you can store information.

📦 For example:

• You can put your name in a box called name.
• Put your age in a box called age.

In Python, we do this like:

name = "Alice"
age = 10

This means:

• The word "Alice" is stored in the variable name.
• The number 10 is stored in the variable age.

💡 Naming Rules for Variables

You can name your boxes (variables) almost anything, but follow these rules:

✅ Good names:

• name
• score
• player_1

🚫 Bad names:

• 1player ❌ (can’t start with a number)
• my-name ❌ (no dashes)
• print ❌ (don’t use special Python words)

🔢 Types of Data

There are three main types of data we’ll use:

Let’s look at each one!

📝 Strings (str) – Words and Sentences

We use quotes to make strings:

greeting = "Hi there!"
name = "Bob"

To show them on screen:

print(greeting)
print("My name is", name)

👉 Output:

Hi there!
My name is Bob

🧒 Kids Corner: Think of strings like labels on your lunchbox — they tell you what’s inside!

➕ Numbers: Integers (int) and Floats (float)

Integers – Whole Numbers

score = 100
lives = 3

Floats – Decimal Numbers

height = 1.5
price = 9.99

Try printing them:

print("Your score is", score)
print("Price:", price)

👉 Output:

Your score is 100
Price: 9.99

✅ Boolean (bool) – True or False

Booleans are used to say YES or NO:

is_student = True
has_key = False

You can print them too:

print("Are you a student?", is_student)

👉 Output:

Are you a student? True

🔁 Changing the Value of a Variable

You can change what’s inside the box anytime:

name = "Alice"
print(name)

name = "Emma"
print(name)

👉 Output:

Alice
Emma

🧪 Try It Yourself!

Write code that does the following:

1. Stores your name in a variable called name.
2. Stores your favorite number in favorite_number.
3. Prints both out like this:

My name is Alice.
My favorite number is 7.

💡 Tip: Use commas to print multiple things.

🧒 Kids Corner

🧠 Imagine your computer is a robot with memory boxes. When you say:

name = "Tom"

It’s like putting a sticky note labeled “name” on a box that says “Tom”.

🤖 Robot thinks:
“I remember Tom!”

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🚀 Challenge (Optional)

Can you write a sentence using all these variables?

animal = "dog"
color = "brown"
number = 3

Example output:

I saw a brown dog today. It was the 3rd one I saw!

📌 Summary

• A variable stores data like a labeled box.
• Common types: str, int, float, bool.
• You can change the value of a variable anytime.
• Use print() to show what’s inside the box.

🔹 Call Of Action

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Python Programming For Beginners To Advanced

Python Programming For Beginners! Lecture 1

Python Programming! Variables and Data Types | Lectures 2

Python Programming! Input And Output | Lectures 3

Python Programming! Operators in Python Lectures 4

Python Programming! Conditional Statements Lectures 5