##random needed for mix method.  Needs to be external to the class
import random

class Bowl:
    ##with a little help from: http://stackoverflow.com/questions/227459/ascii-value-of-a-character-in-python
    ##as well as: http://www.rafekettler.com/magicmethods.html


    ##Constructor!
    ##sorry to change your code, Sean but this allows Bowl to be treated as a list
    def __init__(self, values = None):
        self.values = []

    ##Length
    ##returns length of Bowl
    def __len__(self):
        return len (self.values)

    ##deletes the item at key in self
    def delitem(self, key):
        del self.values[key]

    ##returns the last element in self.values. (top of the stack)
    def top(self):
        return self.values[len(self.values)-1]

    ##appends value to self
    def put(self, ingredient):
        self.values.append(ingredient)

    ##sets value of the top of the stack to ingredient
    def fold(self, ingredient):
        self.values[-1] = ingredient

    ##This adds the value of ingredient to the value of the ingredient
    ##on top of the bowl and sets that sum as the new top of the stack,
    ##erasing what was there.
    def add(self, ingredient):
        holder = self.top()
        holder = holder + ingredient
        self.values[-1] = holder

    ##This subtracts the value of ingredient from the value of the ingredient
    ##on top of the bowl and sets that difference as the new top of the stack,
    ##erasing what was there.
    def remove(self, ingredient):
        holder = self.top()
        holder = holder - ingredient
        self.values[-1] = holder

    ##This multiplies the value of ingredient from the value of the ingredient
    ##on top of the bowl and sets that product as the new top of the stack,
    ##erasing what was there.
    def combine(self, ingredient):
        holder = self.top()
        holder = holder * ingredient
        self.values[-1] = holder

    ##This divides the value of ingredient from the value of the ingredient
    ##on top of the bowl and sets that quotient as the new top of the stack,
    ##erasing what was there.
    def divide(self, ingredient):
        holder = self.top()
        holder = holder / ingredient
        self.values[-1] = holder

    ##This randomises the order of the ingredients
    def mix(self):
        pretend = []
        while(len(self.values)>len(pretend)):
            holder = random.choice(self.values)
            if (pretend.count(holder)>0):
                True
            else:
                pretend.append(holder)
        self.values = pretend

##    This turns all the ingredients in the
##    bowl into a liquid, i.e. a Unicode characters for output purposes.
    def liquify(self):
        better = []
        for x in range (len(self.values)):
            better.append(chr(self.values[x]))
        self.values = better

    ##to string method, so one can print Bowl when needed
    def __str__(self):
        return str(self.values)