elif and else

When there are more than two possibilities — elif chains let you handle them all cleanly, and else catches everything left over.

"Life rarely has just two choices. elif gives your program the same flexibility your brain already has."

— ShurAI

The Problem with Just if...else

Imagine you are building a ticket machine. The price depends on age — child, teen, adult, or senior. With only if and else, you get a messy chain:

python — messy way without elif

# ❌ Ugly — deeply nested, hard to read
if age < 5:
    print("Free")
else:
    if age < 12:
        print("Rs.80")
    else:
        if age < 60:
            print("Rs.200")
        else:
            print("Rs.120")

The same logic using elif is flat, clean, and easy to read at a glance:

python — clean way with elif

# ✅ Clean — flat structure, instantly readable
if age < 5:
    print("Free")
elif age < 12:
    print("Rs.80")
elif age < 60:
    print("Rs.200")
else:
    print("Rs.120")

How Python Walks Through elif

Python checks conditions from top to bottom. The moment one is True, it runs that block and jumps out. Everything below is ignored:

Step 1
Check: age < 5
False → keep going ↓
Step 2
Check: age < 12
False → keep going ↓
Step 3
Check: age < 60
✅ True! → run block, STOP
else
never reached — already stopped above

Example 1 — Weather Advice 🌤️

python

temp = int(input("Temperature today (°C): "))

if temp >= 40:
    print("🔥 Extreme heat! Stay at home.")
elif temp >= 30:
    print("☀️  Hot day. Carry water.")
elif temp >= 20:
    print("😊 Perfect weather. Enjoy!")
elif temp >= 10:
    print("🧥 Bit chilly. Wear a jacket.")
else:
    print("🥶 Very cold! Dress in layers.")

Example 2 — ATM Withdrawal 🏧

python

balance = 5000
amount  = int(input("How much to withdraw? Rs. "))

if amount <= 0:
    print("❌ Invalid amount. Enter a positive number.")
elif amount % 100 != 0:
    print("❌ Please enter a multiple of 100.")
elif amount > 10000:
    print("❌ Maximum withdrawal is Rs.10,000 per day.")
elif amount > balance:
    print(f"❌ Insufficient funds. Balance: Rs.{balance}")
else:
    balance = balance - amount
    print(f"✅ Dispensing Rs.{amount}. Remaining: Rs.{balance}")

Order Matters — Always Think Narrowest First

Put the most specific condition first, widest last. In the ATM example, invalid amounts are caught before checking the balance. If you put amount > balance first, the validation logic would be skipped. When writing elif chains, always ask: "What should I check first?"

Example 3 — Season Finder 📅

python

month = int(input("Enter month number (1-12): "))

if month == 12 or month <= 2:
    print("❄️  Winter — cold and cosy")
elif month <= 5:
    print("🌸 Spring — flowers bloom")
elif month <= 8:
    print("☀️  Summer — hot and sunny")
elif month <= 11:
    print("🍂 Autumn — leaves falling")
else:
    print("⚠️  Invalid month. Enter 1 to 12.")

else — Your Safety Net

else is optional but powerful. It runs when none of the conditions above it matched. It is the perfect place to handle unexpected or invalid input:

python

direction = input("Enter direction (N/S/E/W): ").upper()

if direction == "N":
    print("⬆️  Heading North")
elif direction == "S":
    print("⬇️  Heading South")
elif direction == "E":
    print("➡️  Heading East")
elif direction == "W":
    print("⬅️  Heading West")
else:
    # catches everything else — typos, wrong input
    print(f"'{direction}' is not a valid direction.")

Real Example — Mobile Data Plan Selector 📱

python

print("=== 📱 Data Plan Recommender ===")
usage = int(input("How much data do you use per day (GB)? "))

if usage <= 0:
    print("🤔 You barely use data!")
    print("Recommended: Basic Plan — Rs.99/month (1 GB/day)")
elif usage <= 1:
    print("📧 Light user — calls and messages")
    print("Recommended: Starter Plan — Rs.149/month (1.5 GB/day)")
elif usage <= 2:
    print("📱 Regular user — social media and browsing")
    print("Recommended: Smart Plan — Rs.249/month (2 GB/day)")
elif usage <= 5:
    print("🎬 Heavy user — streaming and gaming")
    print("Recommended: Power Plan — Rs.449/month (2 GB/day + extras)")
else:
    print("🚀 Super heavy user! You need unlimited.")
    print("Recommended: Unlimited Plan — Rs.699/month")

terminal — example output

=== 📱 Data Plan Recommender ===
How much data do you use per day (GB)? 3

🎬 Heavy user — streaming and gaming
Recommended: Power Plan — Rs.449/month (2 GB/day + extras)

"elif is just a tidier way to write nested ifs. Flat is better than nested — your future self will thank you."

— ShurAI

🧠 Quiz — Question 1

What does elif stand for?

🧠 Quiz — Question 2

Given score = 85, what prints?
if score >= 90: print("A") elif score >= 80: print("B") elif score >= 70: print("C") else: print("D")

🧠 Quiz — Question 3

When does the else block run?

🧠 Quiz — Question 4

Is else required at the end of an elif chain?