Python 在递归中只应用一次条件

我只想在复活中应用一个条件.我的数据 struct 如下

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

我想从中随机选取任何阶段，并将状态更改为True.但当真阶段的总数为3时，我想随机将真阶段更改为假阶段.但只有一次.然后它应该继续将阶段变为现实.当所有4个阶段都为真时.递归过程停止.

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)

这在不增加额外条件的情况下有效.我试过下面这个.但这是行不通的

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)