Print all Harshad Numbers in Python

Enter lower bound: 10
Enter upper bound: 49
10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42, 45, 48,

def main():
	"""
	Prints all the Harshad numbers within a given range.
	"""

	a = int(input("Enter lower bound: "))
	b = int(input("Enter upper bound: "))

	for i in range(a, b + 1):
		if is_harshad(i):
			print(i, end=", ")
	print()


def is_harshad(number: int):
	"""
	Checks if a number is a Harshad number or not.
	"""

	total = sum_digits(number)
	return total != 0 and number % total == 0


def sum_digits(number: int):
	"""
	Returns the sum of the digits of a number.
	"""

	BASE = 10
	total = 0

	n = abs(number)
	while n != 0:
		unit_digit = n % BASE
		total += unit_digit
		n //= BASE

	return total


if __name__ == "__main__":
	main()