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Day 2: Types and Variables - Master the Building Blocks of Python!

Welcome back, future Python pro! Yesterday, we introduced Python and wrote our first program. Today, we’re diving deeper into data types and variables—the fundamental building blocks of every program.

What Are Variables?

A variable is like a container where you store data. Think of it as a labeled box where you can put a value and use it later.

Here’s how to create variables in Python:

name = "AI Noob Nook"  # A string
age = 25              # An integer
height = 5.7          # A float
is_coder = True       # A boolean

💡 Python automatically detects the type of data based on the value you assign to it!

Common Data Types

Python supports several data types. Let’s explore the most common ones:

  1. Strings (str): Text data enclosed in quotes.
message = "Hello, World!"
  • Strings can contain letters, numbers, and symbols.
  • You can combine strings using the + operator.
greeting = "Hello" + " " + "Python!"
print(greeting)  # Output: Hello Python!
  1. Integers (int): Whole numbers (positive or negative). 
    count = 42
    • Useful for counting, indexing, or calculations.
  2. Floats (float): Numbers with decimals. 
    price = 19.99
  3. Booleans (bool): True or False values. 
    is_python_easy = True

Often used in decision-making (more on this in Day 3!).

Playing with Variables

Variables can interact with each other:

x = 10
y = 5
z = x + y  # Add two variables
print(z)   # Output: 15

You can even change the value of a variable anytime:

x = 20
print(x)  # Output: 20

Checking Data Types

Want to know the type of a variable? Use the type() function:

value = 42
print(type(value))  # Output: <class 'int'>

Input from Users

Make your program interactive by asking for user input:

name = input("What's your name? ")
print("Hello, " + name + "!")

💡 By default, input is stored as a string. You can convert it using int() or float() if needed:

age = int(input("Enter your age: "))
print("You are", age, "years old.")

Quick Practice

Try these mini exercises to test your knowledge:

  1. Create variables for your name, age, and favorite number, then print them.
  2. Ask the user for two numbers and print their sum.
  3. Check the data type of each variable you create.

Wrap-Up

Today, you learned:

  • How to create variables and assign values.
  • The key data types in Python: strings, integers, floats, and booleans.
  • How to perform basic operations with variables.
  • How to interact with users using input.
  • Take a moment to play with these concepts. Experiment, make mistakes, and learn! Tomorrow, we’ll unlock the power of control flow and see how programs can make decisions.

Happy coding! 🚀

Day 1: Introduction to Python
Day 3: Control Flow – Making Decisions in Python
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