Count palindrome numbers within a range

count_palindrome_num.py

# ================ Palindrome ==================== #

def is_num_palindrome(num: int) -> bool:
    num = abs(num)
    while num > 9:
        exponent = math.floor(math.log10(num))
        msb, remainder = divmod(num, 10 ** exponent)
        num, lsb = divmod(remainder, 10)
        if msb != lsb:
            return False
    return True


assert is_num_palindrome(9) == True
assert is_num_palindrome(10) == False
assert is_num_palindrome(121) == True
assert is_num_palindrome(122) == False
assert is_num_palindrome(10_000) == False
assert is_num_palindrome(0) == True


def count_palindrome_numbers(start: int, end: int) -> int:
    return sum(is_num_palindrome(num) for num in range(start, end))