Sum of Digits From All Numbers in Range

number1 = input("Enter First positive integer, with least 3 digits: ")
number2 = input("Enter Second integer, bigger from the First: ")

number1 = int(number1)
number2 = int(number2)

if number2 < number1:
    temp_num = number1
    number1 = number2
    number2 = temp_num

sum = 0

# Here using nested while loops:

# counter = number1
# while counter <= number2:
#     number_digits = str(counter)
#     index = 0
#     while index < len(number_digits):
#         sum += int(number_digits[index])
#         index += 1
#
#     counter += 1

# Better way is with nested for loops:

for i in range(number1, number2 + 1):
    number_digits = str(i)
    for j in number_digits:
        sum += int(j)

print('The Sum of digits from all numbers in the range [{0} ... {1}] is: {2}'
      .format(number1, number2, sum))