Python if, elif, and else

What Are if, elif, and else?

These conditional statements help Python decide which block of code to run based on whether conditions are True or False.

Use if for the first condition, elif (else if) for more options, and else for a fallback when all other conditions fail.

Basic if Statement

If the condition is true, the code block runs:

Using elif (Else If)

If the initial if is false, Python checks the elif condition.

Using else

If all conditions above are false, else runs as the default block.

Chained Conditions

You can use multiple elif statements to handle more complex cases:

Nested if Statements

A nested if is an if statement placed inside another if or elif block. It lets you perform a second level of decision-making when the outer condition is true.

Use nested conditionals when you want to check another condition only if a previous one is already satisfied.

Indentation Matters

Python uses indentation (typically 4 spaces) to define blocks of code inside if, elif, and else. Missing or incorrect indentation will cause an error.

Practice Prompt

In this exercise, you'll write a Python program that uses if, elif, and else statements to evaluate a number and print whether it is positive, negative, or zero.

Here's what your program should do:

• Check if the number is greater than 0 → Print "Positive"
• If it's equal to 0 → Print "Zero"
• If it's less than 0 → Print "Negative"

Use conditional logic to evaluate each case. Start by checking the most specific condition first (positive), then move to the others.

Expected Output: Negative

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