I need help understanding a program structure using classes

[CompleteNewb]

So it would be impossible to change self.hand in a function inside the class without a setter?

class Player:
    flop = []
    turn = []
    river = ['This is Player.river']
      
    def __init__(self, number, chips):
        self.number = number 
        self.chips = chips
        self.hand = []


    def pickplayershandwithclassvariable(self, deck):
        card = pickacard(deck)
        variable.append(card)
        #Change self.hand here by adding card to the self.hand list
        return self.hand