script_21.py - Number Range Checker

Code

#!/usr/bin/env python3
"""Number range checker"""

num = int(input("Enter a number: "))

if 1 <= num <= 10:
    print("Number is between 1 and 10")
elif 11 <= num <= 20:
    print("Number is between 11 and 20")
elif 21 <= num <= 30:
    print("Number is between 21 and 30")
else:
    print("Number is outside 1-30 range")

Explanation

Line 4: num = int(input("Enter a number: ")) - int() converts to integer type - num stores integer value

Line 6: if 1 <= num <= 10: - Chained comparison - Python allows multiple comparisons - Equivalent to (1 <= num) and (num <= 10) - Both <= comparisons must be True - Checks if num is in range 1 to 10 (inclusive on both ends) - More readable than if num >= 1 and num <= 10 - Evaluates left to right: first checks 1 <= num, then checks num <= 10

Line 8: elif 11 <= num <= 20: - Same chained comparison pattern - Checks range 11-20 inclusive - Only evaluated if previous condition False

Line 10: elif 21 <= num <= 30: - Checks range 21-30 inclusive

Line 12: else: - Catches all numbers outside 1-30 range - Includes negatives, zero, numbers > 30 - Examples: -5, 0, 31, 100