A problem with my text based game

[cousinoer5]

I'm trying to implement a shop in my game, right now I can buy anything in the shop and it works perfectly, but I can't sell anything because I get an error I can't figure out.

Here's the relevent code:

    def shop(self, name):
        self.name = name
        if name == "sapphire":
            if "sapphire" in self.inventory:
                print "I can buy that for 10 gold."
                self.inventory.remove_item("sapphire")
                self.gold += 10
                print "You now have", self.gold, "gold."
            else:
                print "You don't have a", name
        elif name == "emerald":
            if "emerald" in self.inventory:
                print "I can buy that for 20 gold."
                self.inventory.remove_item("emerald")
                self.gold += 20
                print "You now have", self.gold, "gold."
            else:
                print "You don't have an", name
        elif name == "ruby":
            if "ruby" in self.inventory:
                print "I can buy that for 30 gold."
                self.inventory.remove_item("ruby")
                self.gold += 30
                print "You now have", self.gold, "gold."
            else:
                print "You don't have a", name
        elif name == "diamond":
            if "diamond" in self.inventory:
                print "I can buy that for 40 gold."
                self.inverntory.remove_item("diamond")
                self.gold += 40
                print "You now have", self.gold, "gold."
            else:
                print "You don't have a", name
        elif name == "onyx":
            if "onyx" in self.inventory:
                print "That's a really rare gem! \nI'll give you 50 gold for it."
                self.inventory.remove_item("onyx")
                self.gold += 50
                print "You now have", self.gold, "gold."
            else:
                print "You don't have an", name
        else:
            print "I can't buy that."

I'm trying to call this function in a text game base program I imported into this program:

    def remove_item(self, item):
        del self[item.name]

Now when I actually go to sell any one of those items, this error occurs:

Traceback (most recent call last):
File "J:\Alex and the Mysterious Temple.py", line 594, in ?
main()
File "J:\Alex and the Mysterious Temple.py", line 592, in main
adv.play("Alex and the Mysterious Temple")
File "E:\text_game.p y", line 160, in play
self.player.mov e(verb)
File "J:\Alex and the Mysterious Temple.py", line 263, in move
self.shop(sell)
File "J:\Alex and the Mysterious Temple.py", line 163, in shop
self.inventory. remove_item("sa pphire")
File "E:\text_game.p y", line 32, in remove_item
del self[item.name]
AttributeError: 'str' object has no attribute 'name'

Help is appreciated.

[bvdet]

The error message tells you what the problem is. You are in effect trying to do this:

del self["ruby".name]

Maybe something like this would work:

del self.inventory[item]