Now, let's move to the next topic in Python Programming Roadmap:
✅ Python Control Flow Part 1: if, elif, else 🧠💻
What is Control Flow?
👉 Your code makes decisions
👉 Runs only when conditions are met
* Each condition is True or False
* Python checks from top to bottom
🔹 Basic if statement
python
age = 20
if age >= 18:
print("You are eligible to vote")
▶️ Checks if age is 18 or more. Prints "You are eligible to vote"
🔹 if-else example
python
age = 16
if age >= 18:
print("Eligible to vote")
else:
print("Not eligible")
▶️ Age is 16, so it prints "Not eligible"
🔹 elif for multiple conditions
python
marks = 72
if marks >= 90:
print("Grade A")
elif marks >= 75:
print("Grade B")
elif marks >= 60:
print("Grade C")
else:
print("Fail")
▶️ Marks = 72, so it matches >= 60 and prints "Grade C"
🔹 Comparison Operators
python
a = 10
b = 20
if a != b:
print("Values are different")
▶️ Since 10 ≠ 20, it prints "Values are different"
🔹 Logical Operators
python
age = 25
has_id = True
if age >= 18 and has_id:
print("Entry allowed")
▶️ Both conditions are True → prints "Entry allowed"
⚠️ Common Mistakes:
* Using = instead of ==
* Bad indentation
* Comparing incompatible data types
📌 Mini Project – Age Category Checker
python
age = int(input("Enter age: "))
if age < 13:
print("Child")
elif age <= 19:
print("Teen")
else:
print("Adult")
▶️ Takes age as input and prints the category
📝 Practice Tasks:
1. Check if a number is even or odd
2. Check if number is +ve, -ve, or 0
3. Print the larger of two numbers
4. Check if a year is leap year
✅ Practice Task Solutions – Try it yourself first 👇
1️⃣ Check if a number is even or odd
python
num = int(input("Enter a number: "))
if num % 2 == 0:
print("Even number")
else:
print("Odd number")
▶️ % gives remainder. If remainder is 0, it's even.
2️⃣ Check if number is positive, negative, or zero
python
num = float(input("Enter a number: "))
if num > 0:
print("Positive number")
elif num < 0:
print("Negative number")
else:
print("Zero")
▶️ Uses > and < to check sign of number.
3️⃣ Print the larger of two numbers
python
a = int(input("Enter first number: "))
b = int(input("Enter second number: "))
if a > b:
print("Larger number is:", a)
elif b > a:
print("Larger number is:", b)
else:
print("Both are equal")
▶️ Compares a and b and prints the larger one.
4️⃣ Check if a year is leap year
python
year = int(input("Enter a year: "))
if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
print("Leap year")
else:
print("Not a leap year")
▶️ Follows leap year rules:
- Divisible by 4 ✅
- But not divisible by 100 ❌
- Unless also divisible by 400 ✅
📅 Daily Rule:
✅ Code 60 mins
✅ Run every example
✅ Change inputs and observe output