python - When is self statement true and when is false?

Question

Can someone explain this if self.cards condition? When will it be True and when will it be False?

def __init__(self):
    self.cards = []

def __str__(self):
    if self.cards:
        rep = ""
        for card in self.cards:
            rep += str(card) + " "
    else:
        rep = "<empty>"
    return rep

Answer 1

First, you should probably show us when self.cards is used for the first time.
Assuming it is some sort of a container(list, set or dict) it will be true if there are elements in it and false if it is empty.