# SimpleDeck Example
# Implement a class that represents a deck
# of cards numbered from 1 to 20 without any suits.

from random import shuffle

class SimpleDeck:

    # Initialize deck to contain cards
    # numbered 1 to 20.
    def __init__(self):
        self._cards = [ ]
        for card in range(1, 21):
            self._cards.append(card)

    # Display deck as a str object.	
    def __str__(self):
        output = ""
        for card in self._cards:
            output += " " + str(card)
        return output
	
    # Remove top card from the deck
    # and return it.
    def deal(self):
        return self._cards.pop( )

    # Add a card to top of deck
    def add_to_top(self, the_card):
        self._cards.append(the_card)

    # Add a card to bottom of deck
    def add_to_bottom(self, the_card):
        self._cards.insert(0, the_card)

    # Return number of cards in deck
    def count(self):
        return len(self._cards)

    # Return True of deck is empty,
    # False, otherwise.
    def is_empty(self):
        return len(self._cards) == 0

    # Shuffle the cards        
    def shuffle(self):
        shuffle(self._cards)