如何解决Python 类：TypeError：''NoneType'' 对象不可调用？

我正在尝试创建一个 Python 版本的 Monopoly。我有一个单独的类，我用它来洗牌和跟踪机会和公益金卡。卡片存储在列表 chest_cards 和 chance_cards 中。

def __init__(self):
    self.chance = random.shuffle(chance_cards)
    self.chest = random.shuffle(chest_cards)
    self.chance_count = 0
    self.chest_count = 0
    
def chance(self):
    self.chance_count += 1
    return self.chance[self.chance_count - 1]

在我的主代码中，我只是在运行

p = cards()
print (p.chance())

测试我的代码，但打印行得到 TypeError: ''nonetype'' object is not callable。

有什么想法吗？还是需要看更多的代码？ TIA

编辑：这是完整的 cards 课程，如果有帮助的话

import random
global chance_count
global chest_count

class cards:
    global chest_cards
    global chance_cards
    chest_cards = (["Go to Jail","Get Out of Jail Free","Advance to Go (Collect $200)","Bank error in your favor (Collect $200)","Doctor''s fee (Pay $50)","From sale of stock you get $50","Grand Opera Night — Collect $50 from every player","Holiday Fund matures (Collect $100)","Income tax refund (Collect $20)","It is your birthday (Collect $10)","Life insurance matures (Collect $100)","Pay hospital fees of $100","Pay school fees of $150","Receive $25 consultancy fee","You are assessed for street repairs – $40 per house – $115 per hotel","You have won second prize in a beauty contest (Collect $10)","You inherit $100"])

    chance_cards = (["Go to Jail","Advance to Illinois Ave — If you pass Go,collect $200","Advance to St. Charles Place – If you pass Go,"Advance token to nearest Utility. If uNowned,you may buy it from the Bank. If owned,throw dice and pay owner a total ten times the amount thrown.","Advance token to the nearest Railroad and pay owner twice the rental to which he/she is otherwise entitled. If Railroad is uNowned,you may buy it from the Bank.","Bank pays you dividend of $50","Go Back 3 Spaces","Make general repairs on all your property – For each house pay $25  –For each hotel $100","Pay poor tax of $15","Take a trip to Reading Railroad – If you pass Go,"Take a walk on the Boardwalk – Advance token to Boardwalk","You have been elected Chairman of the Board – Pay each player $50","Your building and loan matures — Collect $150","You have won a crossword competition (Collect $100)"])

    def __init__(self):
        self.chance = random.shuffle(chance_cards)
        self.chest = random.shuffle(chest_cards)
        self.chance_count = 0
        self.chest_count = 0
        
    def chance(self):
        self.chance_count += 1
        return self.chance[self.chance_count - 1]

解决方法

random.shuffle

>>> chance_cards = [''card1'',''card2'',''card3'']
>>> chance = random.shuffle(chance_cards)
>>> print(chance)
None

import random,copy #copy isn''t strictly needed but used for clarity
# `new_list=some_list[:]` is functionally equivalent to `new_list=copy.copy(some_list)`
chest_cards = (["Go to..."])
chance_cards = (["Go to Ja..."])

class cards:
    def __init__(self):
        self.chest_cards = copy.copy(chest_cards) #make a local copy so you don''t alter the master list
        random.shuffle(self.chest_cards)

def __init__(self):
     self.chance = chance[:]
     random.shuffle(self.chance)

def __init__(self):
     self.chance = list(random.choices(chance,k=len(chance))

coder@Ubuntu:~$ source activate py37
(py37) coder@Ubuntu:~$ ipython
Python 3.7.0 (default, Jun 28 2018, 13:15:42) 
Type ''copyright'', ''credits'' or ''license'' for more information
IPython 6.5.0 -- An enhanced Interactive Python. Type ''?'' for help.

In [1]: type(1)
Out[1]: int

In [2]: type(1.1)
Out[2]: float

In [3]: type("cba")
Out[3]: str

In [4]: type(12345678987654321)  # 注:这么大的整数，是否为long?
Out[4]: int

In [5]: exit
(py37) coder@Ubuntu:~$ source deactivate
coder@Ubuntu:~$