Can you use self in __str__

[Jean-Michel Pichavant]

----- Original Message -----
> From: "Seymore4Head" <Seymore4Head at Hotmail.invalid>
> To: python-list at python.org
> Sent: Friday, 28 November, 2014 4:31:50 AM
> Subject: Re: Can you use self in __str__
> 
> On Thu, 27 Nov 2014 21:49:29 -0500, Dave Angel <davea at davea.name>
> wrote:
> 
> class Hand:
>     def __init__(self):
>         self.hand = []
>         # create Hand object
> 
>     def __str__(self):
>         s = 'Hand contains '
>         for x in self.hand:
>             s = s + str(x) + " "
>         return s
> 
> I am using 2.7 (Codeskulptor).  This is working code.  It starts with
> an empty list that gets appended from a full deck of shuffled cards.
> dealer=Hand()
> player=Hand()
> I don't really know how to post working code without posting a lot.
>  I
> am not being too successful in trying to post enough code to have it
> work without posting the entire code.
> Here is the link if you want to run it.
> http://www.codeskulptor.org/#user38_Kka7mh2v9u_9.py
> The print out looks like this:
> Hand contains H4 DQ.
> 
> I can (and am) currently printing the hand like this:
> print "Player's",player
> print "Dealer's",dealer
> 
> My question is can you add (self) in the __str__ so when you issue
> the
> command "print player" the "player" part is included in the __str__.
> --
> https://mail.python.org/mailman/listinfo/python-list


I think your main problem is a design issue.

I won't go into details, it would be too long but here's a way to fix your problem:

# Untested code

class Player(object):
  def __init__(self, name):
    self.name = name
    self.hand = Hand()
  
  def __str__(self):
    return '%s<%s> has %s' % (self.__class__.__name__, self.name, self.hand)

# A dealer is a special type of player
class Dealer(Player): pass

def deal():
    global outcome, in_play,deck,dealer,player
    
    # your code goes here
    deck=Deck()
    deck.shuffle()
    print deck
    players = [Dealer('Robert'), Player('John')]

    for deal in range(2):
      for player in players:
        player.hand.add_card(deck.deal_card())

    for player in players:
      print str(player)
    in_play = True


With the above design, the relation between player and its hand is implemented with the Player attribute "hand".
It's a classic design where the container knows about the content, but the content does not know its container.

There are other solutions which do not require a new class, but I have the feeling you will need the Player class in the future.

Moreover The design above I gave you will be probably broken in the future when you add features to your code.

The same player may be a dealer or not, it may vary over time. You will probably need a 'Table' object which handles a collection of players, with a dealer, small blind, big blind etc, amount of money in the pot etc...

JM


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