Validate try except ValueError handler for beginners — errors debugging

def divide_numbers(a, b):
    """Divide two numbers, catching division by zero and value errors."""
    try:
        result = a / b
    except ZeroDivisionError:
        print("Error: Cannot divide by zero!")
        return None
    except TypeError:
        print("Error: Both arguments must be numbers!")
        return None
    else:
        print(f"{a} / {b} = {result}")
        return result
    finally:
        print("Division attempt completed.")


# Edge cases to reproduce errors
print("Testing valid input:")
value = divide_numbers(10, 2)
print(f"Result returned: {value}\n")

print("Testing division by zero:")
value = divide_numbers(5, 0)
print(f"Result returned: {value}\n")

print("Testing type error:")
value = divide_numbers(8, "2")
print(f"Result returned: {value}\n")


def is_valid_age(age_str):
    """Validate user age input using try/except ValueError."""
    try:
        age = int(age_str)
        if age < 0 or age > 120:
            raise ValueError("Age must be between 0 and 120")
        return age
    except ValueError as e:
        print(f"Invalid input: {e}")
        return None


print("Validating age inputs:")
for test in ["25", "-5", "abc", "150", "70"]:
    result = is_valid_age(test)
    print(f"Input '{test}' -> {result}\n")


if __name__ == "__main__":
    print("Program finished.")