在 Python 中创建用于查找概率的函数时出错

问题描述

这是我为挑战而写的代码

挑战链接：

    import random
    
    def list_to_dict(input_list):
        dictionary = {}
        for element in input_list:
            if element in dictionary:
                dictionary[element] += 1
            else:
                dictionary[element] = 1
        return dictionary            
    
    class Hat():
        def __init__(self,**kwargs):
            if len(kwargs) >= 1:
                self.__dict__.update(kwargs)
            contents = []
            for key,value in self.__dict__.items():
                for i in range(int(value)):
                    contents.append(key)
            self.contents = contents
    
        def print_contents(self):
            print(self.__dict__)
                    
        def draw(self,number_of_balls):
            if number_of_balls >= len(self.contents):
                return self.contents
            else:
                return_balls = []
                for i in range(number_of_balls):
                    x = len(self.contents) - 1
                    index = random.randint(0,x)
                    return_balls.append(self.contents[index])
                    self.contents.pop(index)
                return return_balls    
    
    def experiment(hat,expected_balls,num_balls_drawn,num_experiments):
        N = num_experiments
        M = 0
    
        for i in range(N):
            res = hat.draw(num_balls_drawn)
            res_dict = list_to_dict(res)
            
            count = 0
            for k,v in expected_balls.items():
                if res_dict.get(k) == None or res_dict.get(k) < v:
                    count += 1
    
            if count == 0:
                M += 1
    
        return M / N

       

它可以作为示例运行

    hat = Hat(blue=3,red=2,green=6)
    print(experiment(hat=hat,expected_balls={"blue":2,"green":1},num_balls_drawn=4,num_experiments=1000))

在我上面给出的例子中，experiment 函数的返回值应该在 0.272 左右，但它几乎总是返回 0.0。谁能帮我解释一下为什么会这样？谢谢

解决方法

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