打印类实例列表的随机实例，但得到RecursionError python3

Question

import random

class cards():

    def __init__(self,val,suit):
        self.val = val
        self.suit = suit

    def __repr__(self):
       return str(self)

deck = []
card_val = ['A','2','3','4','5','6','7','8','9','10','J','Q','K']
card_suit = ['♦','♥','♠','♣']

for x in card_val:
    for y in card_suit:
        card = cards(x,y)
        deck.append(card)

print(random.choice(deck))

When it tries to print it gets the following error:

RecursionError: maximum recursion depth exceeded while calling a Python object

I'm very new with class instances. I looked around and couldn't find any answers that worked. Any help would be appreciated.

Answer 1

The __str__ method calls the __repr__ by default, and you've overridden the __repr__ method to call the __str__ method by calling the str function on self , resulting in an infinite recursion when you try to print a cards object.

You should make the __str__ method return a reasonably readable representation of the cards object instead:

def __str__(self):
   return self.val + self.suit