Day 4 : Variables, Data Types & User Input

Today I learned about variables, data types, and how to take input from the user.
This is an important foundation because almost every Python program stores and processes information.

What I Learned Today

• Variables are used to store values
• Python has multiple data types:
  • str - text
  • int - whole numbers
  • float — decimal numbers
  • bool - True/False
• input() is used to collect user input
• Input is always a string unless converted
• int() or float() convert numbers
• Functions can return calculated values

Example Code From Day 4

# Day 4 — Variables, Data Types & User Input

# Asking for input
name = input("What is your name? ")

# Asking for number input and converting it
age = int(input("What is your age? "))

# Doing a calculation
next_year_age = age + 1

# A helper function
def make_greeting(name, age):
    return f"Hello {name}, you will be {age} next year!"

# Calling the function
message = make_greeting(name, next_year_age)

print(message)

Expected Output

What is your name? Rekha
What is your age? 32
Hello Rekha, you will be 33 next year!

Output Screenshot

Summary

Today I learned: • How Python stores information using variables • How to work with strings, numbers, and booleans • How to use input() to read user input • How to convert input values into numbers • How to return formatted results from a function

These concepts are the building blocks for writing interactive programs.

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What’s Next?

•	if / elif / else statements
•	Making decisions in Python
•	Comparing values
•	Running different code based on conditions

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