Very succinct solution. This should fall under Creative - using set class, and leveraging its class via super(). But then I may have missed out on this solution, if it were under creative too. :) More

concise, creative... but hard to understand...Need to look deeper I guess :P More

Has a bug. wouldn't work for the below case: print(checkio("This is an IP address 192.168.1.1 that costs $5.000,00")) More

Your solution looks more readable, and uses latest features. Great job. Obviously you are one of the greatest programmer (in python, especially in this site). What should be the result of aggr_operation([("*a", 5), ("*a", 10), ("/a", 2)]) ? Should it be {'a': 25} or {'a': 0} (in other words More