gilded_rose.py

# -*- coding: utf-8 -*-
"""
>>> update_item(Item("a", 1, 2))
a, 0, 1
>>> update_item(Item("a", 1, 1))
a, 0, 0
>>> update_item(Item("a", 1, 0))
a, 0, 0
>>> update_item(Item("a", 0, 3))
a, -1, 1
>>> update_item(Item(AGED_BRIE, 1, 1))
Aged Brie, 0, 2
>>> update_item(Item(AGED_BRIE, 0, 1))
Aged Brie, -1, 3
>>> update_item(Item(AGED_BRIE, 0, 50))
Aged Brie, -1, 50
>>> update_item(Item(SULFURAS, 0, 80))
Sulfuras, Hand of Ragnaros, 0, 80
>>> update_item(Item(SULFURAS, 0, 50))
Sulfuras, Hand of Ragnaros, 0, 50
>>> update_item(Item(PASS, 11, 4))
Backstage passes to a TAFKAL80ETC concert, 10, 5
>>> update_item(Item(PASS, 10, 4))
Backstage passes to a TAFKAL80ETC concert, 9, 6
>>> update_item(Item(PASS, 6, 4))
Backstage passes to a TAFKAL80ETC concert, 5, 6
>>> update_item(Item(PASS, 5, 4))
Backstage passes to a TAFKAL80ETC concert, 4, 7
>>> update_item(Item(PASS, 0, 4))
Backstage passes to a TAFKAL80ETC concert, -1, 0
>>> update_item(Item(CONJURED, 3, 5))
Conjured, 2, 3
>>> update_item(Item(CONJURED, 0, 5))
Conjured, -1, 1
>>> update_item(Item(CONJURED, 0, 2))
Conjured, -1, 0
>>> update_item(Item(CONJURED, 1, 1))
Conjured, 0, 0
"""

PASS = "Backstage passes to a TAFKAL80ETC concert"
SULFURAS = "Sulfuras, Hand of Ragnaros"
AGED_BRIE = "Aged Brie"
CONJURED = "Conjured"


def update_item(item):
        if item.name == CONJURED:
            if item.sell_in <= 0:
                item.quality -= 4
            else:
                item.quality -= 2
            item.quality = max(item.quality, 0)
            item.sell_in -= 1
            return item
        if item.name == SULFURAS:
            return item
        if item.name == AGED_BRIE:
            if item.sell_in <= 0:
                item.quality += 2
            else:
                item.quality += 1
            item.quality = min(item.quality, 50)
            item.sell_in -= 1
            return item
        if item.name == PASS:
            if item.sell_in <= 0:
                item.quality = 0
            elif item.sell_in <= 5:
                item.quality += 3
            elif item.sell_in <= 10:
                item.quality += 2
            else:
                item.quality += 1
            item.quality = min(item.quality, 50)
            item.sell_in -= 1
            return item
        if item.quality > 0:
            item.quality = item.quality - 1
        if item.sell_in <= 0:
            if item.quality > 0:
                item.quality = item.quality - 1
        item.sell_in = item.sell_in - 1
        return item


def update_quality(items):
    for item in items:
        update_item(item)
    return items


class Item:
    def __init__(self, name, sell_in, quality):
        self.name = name
        self.sell_in = sell_in
        self.quality = quality

    def __repr__(self):
        return "%s, %s, %s" % (self.name, self.sell_in, self.quality)

item.py

"""
    This module, on request, includes a namedtuple that has attr access
    as well as index access to the values by name
"""
from collections import namedtuple
Item = namedtuple('Item', ['name', 'sell_in', 'quality'])
Item.__getitem__ = lambda self, index: getattr(self, index) if isinstance(index, str) else super(Item, self).__getitem__(index)