Python Validate a Range with and Instead of Nested if Statements

This guide explains Validate a Range with and Instead of Nested if Statements through a focused example and practical reasoning. No prior knowledge of this specific operation is required.

Understanding the Concept

A single chained or combined range check is usually simpler than nested if statements. State clearly whether boundaries should be included or excluded.

When You Would Use This

Check that an entered score lies in the interval from 0 through 100.

Step-by-Step Example

score = 87
if 0 <= score <= 100:
    print("Valid score")
else:
    print("Out of range")

How the Example Works

The chained comparison performs two tests: score >= 0 and score <= 100. Both must be true.

Example Output

Valid score

Try It Yourself

Reject scores -2 and 104; confirm that 0 and 100 are accepted.

Common Beginner Mistakes

• Accidentally excluding 0 or 100 from an inclusive interval.
• Reversing the relationship between lower and upper bounds.
• Forgetting that text input must be converted before numeric comparison.

Key Takeaways

• A single chained or combined range check is usually simpler than nested if statements.
• The chained comparison performs two tests: score >= 0 and score <= 100.
• Avoid this mistake: Accidentally excluding 0 or 100 from an inclusive interval.