Welcome back to the Python Tutorial Series for Beginners! 🎉

In Lesson 1, we installed Python, set up VS Code, and ran our first program.
Now in Lesson 2, we’ll learn one of the most important concepts in programming: Variables & Data Types.

By the end of this lesson, you’ll know how to:

• Create and use variables in Python
• Understand Python’s built-in data types (strings, integers, floats, booleans)
• Combine them in simple programs

🔹 What is a Variable?

A variable is like a container that stores data in your program.
Think of it as a box with a label on it. You put a value inside, and you can use it later.

Example:

name = "Kingsley"
age = 25

Here,

• name is a variable storing a string "Kingsley"
• age is a variable storing an integer 25

🔹 Rules for Naming Variables

1. Names must start with a letter or underscore (_)
2. Names cannot start with a number
3. No spaces (use underscores _ instead)
4. Variable names are case-sensitive (Age and age are different)
5. Use descriptive names for clarity

✅ Good examples:

user_name = "Alice"
user_age = 30

❌ Bad examples:

1user = "Alice"     # starts with a number
user-name = "Bob"   # hyphens not allowed

🔹 Data Types in Python

Python automatically understands the type of data stored in a variable. The common types are:

1. String (str) – Text inside quotes

greeting = "Hello, World!"

2. Integer (int) – Whole numbers

age = 25 

3. Float (float) – Decimal numbers

price = 19.99 

4. Boolean (bool) – True or False

is_student = True 

🔹 Checking Data Types

You can use the built-in type() function to check what type a variable is:

x = "Hello"
y = 10
z = 3.14
flag = False
print(type(x))  # <class 'str'>
print(type(y))  # <class 'int'>
print(type(z))  # <class 'float'>
print(type(flag))  # <class 'bool'>

🔹 Changing Values

You can reassign variables at any time:

name = "Kingsley"
print(name)   # Kingsley
name = "John"
print(name)   # John

🔹 Exercises for Beginners

Try these in your Python file (lesson2.py):

1. Create a variable city and store your city’s name.
2. Create two variables x = 5 and y = 3. Print their sum.

3. Store your age in a variable and print:

    

   print("I am", age, "years old") 

4. Challenge: Create variables for a product: product_name, price, and in_stock. Print them in a single line like:

    

   Product: Laptop | Price: 350000 | Available: True 

🎯 Recap

In this lesson, you learned:
✅ What variables are and how to create them
✅ Rules for naming variables in Python
✅ Python’s main data types (string, integer, float, boolean)
✅ How to check and update variable values

Next up: Lesson 3 – Operators in Python (arithmetic, comparison, and logical operators). 🚀