Hi
I have been working on a blackjack program and i have hit a brick wall as one of my Global assignments isn't working for some reason

import random
class Cards(object):
    def __init__(self):
        global cards
        global player  
        global comp
        global comp_tot
        global playert
        cards = {2:4,3:4,4:4,5:4,6:4,7:4,8:4,9:4,10:16,'ace':4}
        player = []
        playert = 0
        comp_tot=0
        comp = []
        print playert,'hi'
        print "The Game is Blackjack"
    def draw(self):
        f = cards.keys()
        a = random.choice(cards.keys())
        cards[a]-=1
        if cards[a] == 0:
            del cards[a]
            if len(cards)==0:
                print "out of cards"
                return False
        return a
    def First_turn(self):
        print comp_tot
        print cards
        print player
        print playert
        card1=self.draw()
        card2=self.draw()
        card2='ace'
        if card1 is not 'ace' and card2 is not 'ace':
            player.append(card1)
            player.append(card2)
            value=card1+card2
            print "your cards are:",card1,"and",card2
            print value
            playert+=value
        else:
            player.append(card1)
            player.append(card2)
            count =0
            if card1 =='ace':
                count = 'c1'
                if playert+11>21:
                    val = 1
                else:
                    val=11
            elif card2 == 'ace':
                count ='c2'
                if playert + 11 >21:
                    val = 1
                else:
                    val = 11
            
                

c = Cards()
c.First_turn()

every other global variable works exept playert. Any help on how to fix this would be appreciated. Oh also the error i am getting goes like this

Traceback (most recent call last):
  File "C:/Documents and Settings/Paul/My Documents/Python/projects/Blackjack/jack1.0.py", line 61, in <module>
    c.First_turn()
  File "C:/Documents and Settings/Paul/My Documents/Python/projects/Blackjack/jack1.0.py", line 30, in First_turn
    print playert
UnboundLocalError: local variable 'playert' referenced before assignment

oh and also sorry for all the added prints, they were for debugging purposes

One advantage of the class structure is that you don't use globals but self.var_name.

import random
class Cards(object):
    def __init__(self):
        self.cards = {2:4,3:4,4:4,5:4,6:4,7:4,8:4,9:4,10:16,'ace':4}
        self.player = []
        self.playert = 0
        self.comp_tot=0
        self.comp = []
        print self.playert,'hi'
        print "The Game is Blackjack"
    def draw(self):
        f = self.cards.keys()
        a = random.choice(self.cards.keys())
        self.cards[a]-=1
        if self.cards[a] == 0:
            del self.cards[a]
            if len(self.cards)==0:
                print "out of cards"
                return False
        return a
    def First_turn(self):
        print self.comp_tot
        print self.cards
        print self.player
        print self.playert
        card1=self.draw()
        card2=self.draw()
        card2='ace'
        if card1 is not 'ace' and card2 is not 'ace':
            self.player.append(card1)
            self.player.append(card2)
            value=card1+card2
            print "your cards are:",card1,"and",card2
            print value
            playert+=value
        else:
            self.player.append(card1)
            self.player.append(card2)
            count =0
            if card1 =='ace':
                count = 'c1'
                if self.playert+11>21:
                    val = 1
                else:
                    val=11
            elif card2 == 'ace':
                count ='c2'
                if self.playert + 11 >21:
                    val = 1
                else:
                    val = 11
            
                

c = Cards()
c.First_turn()

Welcome to the world of self! Just a side note, the Python style guide recommends to start class names with upper case and function/method names with lower case. If you write larger programs, this really helps.

The Python style guide by GVR himself:
http://www.python.org/peps/pep-0008.html

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