Fun with decimals, useful for big numbers

decimals.py

from decimal import Decimal
import re

def ddiff(str):
    numbers = re.findall(r'\d+', str)
    print(f'0: {numbers[0]}')
    print(f'1: {numbers[1]}')
    print(f'diff: {Decimal(numbers[0]) - Decimal(numbers[1])}')

def dsum():
    items = []
    while True:
        num = input('Enter number: ')
        if not num: break
        items.append(Decimal(num))

    print('---')
    print(f'Numbers: {items}')
    print(f'Sum: {sum(items)}')