If elif else statement in Python

Mike 43 Published: 07/27/2024

If elif else statement in Python

I'll respond in English.

The if, elif, and else statement is a fundamental concept in programming, especially in Python. It's used to make decisions based on certain conditions or criteria. Here's how it works:

Basic Syntax

if condition:
code block if condition is True

elif another_condition:

code block if another_condition is True

else:

code block if none of the above conditions are True

How it Works

Let's break it down step by step:

If: The if statement checks whether a specific condition is met (True). If it is, then the code within the indented block is executed. Elif: If the initial condition is False, Python looks at the next elif statement and evaluates its condition. If this condition is True, the code within that block will be executed. This process continues until a condition is met. Else: If none of the above conditions are met (i.e., all are False), then the code within the else block will be executed.

Example

Let's consider an example: A simple calculator program to determine whether a person is eligible for a credit card based on their income and credit score:

income = 50000

credit_score = 750


if income > 60000:


print("You're eligible for the credit card!")


elif credit_score >= 800:


print("Your credit score is excellent, you might be eligible.")


else:


print("Sorry, your income and credit score don't meet the requirements.")

Output

Based on this example:

If income > 60000: "You're eligible for the credit card!" (condition met) Else (credit_score evaluation starts): If credit_score >= 800: "Your credit score is excellent, you might be eligible." (condition met)

Final Output

The final output would be: "You're eligible for the credit card!"

Key Takeaways

Conditions are evaluated in order: Python evaluates conditions in the order they appear, from top to bottom. At least one condition must be True: If none of the conditions are met (i.e., all False), then the else block will be executed.

In conclusion, the if, elif, and else statement is an essential tool in programming, allowing us to make decisions based on various conditions. By understanding how this structure works, you'll be able to write more efficient and effective code.

Hope that helps!

Python elif w3schools

Here's the requested content:

Python if/else and elif Statements

In Python programming language, if, elif (else if), and else statements are used for conditional execution of a block of code. They allow you to make decisions based on certain conditions or criteria.

Basic Syntax:

if condition:
execute this block if condition is True

elif other_condition:


execute this block if first condition is False but second condition is True

else:

execute this block if all previous conditions are False

Let's understand the concept with an example from W3Schools:

Example:

# Get user input for age

age = int(input("Enter your age: "))

Use if/elif statement to determine which message to display based on age

if age >= 18:


print("You are an adult.")


elif age < 13:


print("You are a child.")


else:


print("You are a teenager.")

How it works:

The code first asks the user for their age. It then uses an if statement to check if the age is 18 or more. If this condition is True, it prints "You are an adult." If the age is less than 13 (i.e., it's a child), the elif statement takes over and prints "You are a child." If none of the above conditions are met, the code falls into the else block and prints "You are a teenager."

Key Takeaways:

The order of if, elif, and else statements matters. Each condition is evaluated in sequence until one is found to be True. If no conditions are met, the code will execute the default else block (in this example, printing "You are a teenager.").

In conclusion, Python's if, elif, and else statements provide a powerful way to make decisions based on specific conditions or criteria. With this basic understanding, you can begin building more complex conditional logic in your own Python projects!

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