python - 在递归中仅应用一次条件

Question

我只想在递归中应用一次条件。我的数据结构如下所示

stages = {"stage_1": False, "stage_2":False, "stage_3":False,"state_4": False}

我想从中随机选择任何阶段并将状态更改为 True。但是当 true 阶段总数为 3 时，我想随机将 True 阶段更改为 False。但只有一次。然后它应该继续将阶段变为 True。当所有 4 个阶段都为真时。递归过程停止。我怎样才能做到这一点 ？我已经尝试过以下代码。但它并不完整。

def process(stages):
    all_stages = [stage for stage, status in stages.items() if status == False]
    if len(all_stages) !=0:
        print(all_stages)
        select_ = random.choice(all_stages)
        print("\tselected stage: ",select_)
        
        stages[select_] = True
        process(stages)
    else:
        print("Done")
        print(stages)

process(stages)

无需添加额外条件即可工作。我已经尝试过以下一种。但这不起作用

def process(stages):
    all_stages = [stage for stage, status in stages.items() if status == False]
    if len(all_stages) !=0:
        print(all_stages)
        select_ = random.choice(all_stages)
        print("\tselected stage: ",select_)
        
        stages[select_] = True

        if len(all_stages) == 1:
            select_ = random.choice([stage for stage, status in stages.items() if status == True])
            stages[select_] = False
        process(stages)
    else:
        print("Done")
        print(stages)

process(stages)

Answer 1

代码是@NoBlockhit的建议

stages = {"stage_1": False, "stage_2":False, "stage_3":False,"state_4": False}

status = True
def process(stages):
    global status
    print(status)
    all_stages = [stage for stage, status in stages.items() if status == False]
    if len(all_stages) !=0:
        print(all_stages)
        select_ = random.choice(all_stages)
        print("\tselected stage: ",select_)
        
        stages[select_] = True

        if status:
            if len(all_stages) == 1:
                select_ = random.choice([stage for stage, status in stages.items() if status == True])
                stages[select_] = False
                status = False
        process(stages)
    else:
        print("Done")
        print(stages)

process(stages)