Question

我想运行我的代码，但是，我不断收到错误消息。这是关于一个表单字段，在其中输入其值。如果该值在特定范围内，则将获得1欧元。代码是：

class Guess(Page):
    form_model = 'player'
    form_fields = ['guess']

    def is_displayed(self):
        return self.round_number == 2

    def vars_for_template(self):
        if self.player.guess >= 11.25 and self.player.guess <= 13.75:
            self.player.cumulative_guthaben = self.player.cumulative_guthaben + 1
        else:
            self.player.cumulative_guthaben = self.player.cumulative_guthaben

            return {
                'current_credit': self.player.cumulative_guthaben,
                'anzahlspieler': Constants.number_of_players,
                'round_number': self.round_number,}

我确实知道这是一个类型错误，但是我没有成功解决它

Here is a shorter Version of my Class: 
class Player(BasePlayer): 
guthaben = models.CurrencyField(initial=c(0)) 
cumulative_guthaben = models.CurrencyField() 
donation = models.FloatField(min=c(0)) 
earnedmoney = models.CurrencyField() 
frequency = models.StringField() 
rival = models.StringField() 
guess = models.FloatField(label="Your Guess:")

Answer 1

您会收到错误，因为在某个时刻self.player.guess是NoneType，它应该是浮点数才能将其与浮点数进行比较。您可以使用isinstance(i, type)。您不需要其他，因为您无需更改self.player.cumulative_guthaben的值。但是您应该检查其余的代码，为什么self.player.guess是NoneType。像这样：

class Guess(Page):
    form_model = 'player'
    form_fields = ['guess']
    def is_displayed(self):
        return self.round_number == 2

    def vars_for_template(self):
        if isinstance(self.player.guess, float):
            if (self.player.guess >= 11.25 and self.player.guess <= 13.75):
                self.player.cumulative_guthaben = self.player.cumulative_guthaben + 1
        return {
            'current_credit': self.player.cumulative_guthaben,
            'anzahlspieler': Constants.number_of_players,
            'round_number': self.round_number,}

'NoneType'和'float'的实例之间不支持'> ='

1 个答案: