This is a rating system in Python based on the Elo rating system created by Arpad Elo. You can use it on lists and do all kinds of fun stuff, like finding out what your favourite vegetable is.
But why use the Elo system? Surely you can rank vegetables in O(n log(n)) time instead?
The Elo system is designed to work over longer periods of time. Let's say cabbage is your favourite vegetable but one day you wake up and feel a sudden urge to eat some lettuce. In that moment you may rank lettuce higher than cabbage but in the grand scheme of things cabbage is still your favourite vegetable. Simple ranking-based rating systems do not take this into account.
You can either enter the filename when prompted or hard-code it in the source. You can enter the filename without the .txt suffix. If you're feeling particularly cool you can pass the filename as a commandline argument:
python3 elo.py test_list
If you make the file elo.py executable (using chmod +x elo.py) you can also type ./elo.py test_list, saving an additional 6 (!!!!!) characters.
If you want to reset your list you can add init as an argument when running the command: python3 elo.py test_list init
You can use this script on any text list in the following format:
Apple, 0, 1000,
Orange, 8, 1200,
Pear, 3, 998,
Peach, 4, 982,
Melon, 3, 899,
Lemon, 1, 1002,
The first number (counter) is the amount of times this item has been questioned against another item and the second number (elo) is the Elo rank
The script will also recognize lists in this format:
Grapes
Apricot
Watermelon
Pineapple
Papaya
Strawberry
If the list solely consists of names, the script will initialise it with a counter of 0 and an Elo rank of 1000.
Mixed lists are also permitted and the comma at the end of the line is not necessary - a newline however is necessary in any case. If there are too many newlines, the program will delete all empty lines.
Another legal example:
Cabbage, 0, 1000,
Ginger
Tomato, 0, 1002
Carrot
Beans
Potato, 3, 990
You'll be presented with two options. Enter 1 or 2 to decide which is better. If you're undecided enter 3 and when you get bored press Ctrl+C.