gilded_rose.py

class GildedRose(object):

  def __init__(self, name, quality, days_remaining):
    self.name = name
    self.quality = quality
    self.days_remaning = days_remaining

  def tick(self):
    if self.name != 'Aged Brie' and self.name != 'Backstage passes to a TAFKAL80ETC concert':
      if self.quality > 0:
        if self.name != 'Sulfuras, Hand of Ragnaros':
          self.quality -= 1
    else:
      if self.quality < 50:
        self.quality += 1
        if self.name == 'Backstage passes to a TAFKAL80ETC concert':
          if self.days_remaining < 11:
            if self.quality < 50:
              self.quality += 1
          if self.days_remaining < 6:
            if self.quality < 50:
              self.quality += 1

    if self.name != 'Sulfuras, Hand of Ragnaros':
      self.days_remaining -= 1

    if self.days_remaining < 0:
      if self.name != 'Aged Brie':
        if self.name != 'Backstage passes to a TAFKAL80ETC concert':
          if self.quality > 0:
            if self.name != 'Sulfuras, Hand of Ragnaros':
              self.quality -= 1
        else:
          self.quality = self.quality - self.quality
      else:
        if self.quality < 50:
          self.quality += 1