If - Else

Part of the Fundamentals section of Coddy's Python journey — lesson 21 of 77.

if allows us to execute particular code if a condition is met, but what if we want to execute something else if the condition is not met?

For that we have the else statement:

age = 15
status = "None"
if age >= 18:
	status = "Adult"
else:
	status = "Young"

In the above example, age is smaller than 18 which means it enter the else code and status will hold "Young".

We can even make it more profound using the elif statement:

age = 68
status = "None"
if age < 18:
	status = "Young"
elif age >= 18 and age <= 65:
	status = "Adult"
else:
	status = "Old"

Here it checks whether age is smaller than 18, if not it will continue to the next condition and check whether age is between 18 and 65. If that condition is also not met it will set status to "Old".

We can add as many elif statements as we want:

if condition1:
	code
elif condition2:
	code
elif condition3:
	code
...

Note that the code inside the if/elif/else must be indented

Challenge

Beginner

You are given a code which gets as input a number that indicates the wind speed and stores it in a variable named wind.

Note: we will learn in next lessons how to get input from the user, currently just don't touch the first line.

Your task is to initialize variable status based on the conditions:

"Calm" if wind is smaller than 8,
"Breeze" if wind is between 8 and 31 (including 8 and 31).
"Gale" if wind is between 32 and 63 (including 32 and 63)
"Storm" otherwise

Check the test cases to see all the inputs and the expected outputs

Cheat sheet

Conditional statements in Python:

if condition:
    code
elif another_condition:
    code
else:
    code

Example with multiple conditions:

age = 68
status = "None"
if age < 18:
    status = "Young"
elif age >= 18 and age <= 65:
    status = "Adult"
else:
    status = "Old"

Important:

Code inside if, elif, and else blocks must be indented.
You can have multiple elif statements.
The else block is optional and executed when no conditions are met.

Try it yourself

wind = int(input()) # Don't change this line
status = "unset"
# Type your code below


# Don't change the line below
print(f"status = {status}")

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments

4Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Logical Operators Part 4

7Bill Split Calculator

Welcome Message Getting Input

Calculating The Tip And Total

Splitting The Bill

Formatted Output

10FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

13Lists Advanced

List Slicing Part 1 List Slicing Part 2 Sequence Operators Membership

2Variables

Numbers String Boolean Naming Conventions Empty Variables Recap - Initialize Variables

5Decision Making

If StatementIf - ElseRecap - Simple Calculator Nested If - Else

8Loops

For Loop While Loop Break Continue Recap - Factorial The Range Function Nested Loop Recap - Dynamic Input

11Lists Basics

Declaring a List Accessing List Elements Modifying Lists List Methods Recap - Product List Recap - Reversed List Tuple

14Daily Expense Tracker

Project Overview Exit The Program

3Operators Part 1

Arithmetic Operators Modulo Operator Arithmetic Shortcuts Recap - Simple Math Comparison Operators

6Basic IO

Output Output With Variables Input Cast Recap - Till 120 Recap - True or False

9Functions

Declare a Function Arguments Return Recap - Sigma Function Recap - Validation Function Default Values

12Iterating Over Sequences

Iterating Over Elements The Enumerate Function Iterating Over Strings Part 1 Iterating Over Strings Part 2

15Final Challenges

Flat Asterisk Pyramid Pattern Finder What To Buy