script_2.py - Grade Evaluator

Code

#!/usr/bin/env python3
"""Grade evaluator"""

score = float(input("Enter your test score: "))

if score >= 90:
    print("Grade: A")
elif score >= 80:
    print("Grade: B")
elif score >= 70:
    print("Grade: C")
elif score >= 60:
    print("Grade: D")
else:
    print("Grade: F")

Explanation

Line 4: score = float(input("Enter your test score: ")) - input() returns a string type (str) - float() converts string to floating-point decimal number - float type allows decimal values like 85.5 - score variable stores the float value

Line 6: if score >= 90: - First condition checked in the chain - If True, executes line 7 and skips all elif/else blocks

Line 8: elif score >= 80: - elif means "else if" - only checked if previous conditions are False - Checks if score is between 80 and 89.99 - Multiple elif allows checking ranges in order

Line 10-13: Additional elif blocks - Each elif is only evaluated if all previous conditions were False - Creates cascading range checks: 70-79 for C, 60-69 for D

Line 14: else: - Catches all remaining cases (score < 60) - Only executes if none of the if/elif conditions were True