‘sup guys,
I’m just doing my usual random little programs before my exam within a few days and I decided to write a five card draw poker. Since it’s simply for playing a bit with code, I didn’t inherit anything from basic classes. My deck contains a list attribute, which has been given the functionality it needs for simple readability and functionality:
import random
from card import Card
class Deck():
def __init__(self):
self.cards = self.__generate_cards()
random.shuffle(self.cards)
def __str__(self):
cards_str = ""
for card in self.cards:
cards_str += str(card)
return cards_str
def __getitem__(self,index):
return self.cards[index]
def __generate_cards(self):
cards = []
for i in range(4):
for j in range(13):
cards.append(Card(i,j+1))
return cards
def pop(self,index):
return self.cards.pop(index)
as you can see, there is no .__iter__ method to be found, which means I can’t iterate over a Deck() object right? Python shows me a different story: for some reason the next code results in looping over the card objects in self.cards and actually printing the cards without the need of an iterator:
deck = Deck()
for card in deck:
print(card) # cards have a __str__ method
Doesn’t make much sense to me, unless it’s part of the python magic, giving any object a chance for possible looping. ;p
Can anyone show me the light with this one? thanks in advance!
Why does defining __getitem__ on a class make it iterable in python?
It’s a back-compat thing. Having
__getitem__makes it iterable.