不知道如何解決builtin.TypeError的

Question

嘿，我有兩個錯誤，當我輸入飲料，並輸入糖的數量我得到「builtins.TypeError：'str'對象不可調用」，當我輸入AlcoholicDrink和金額的糖和酒精我得到「builtins.TypeError：無法將'float'對象隱式轉換爲str」。我仍然學習編碼，所以我不擅長錯誤任何幫助表示讚賞！

class Drink: 
    def __init__(self, sugar): 
     self.sugar = sugar 

    def numberOfCalories(self): 
     return 3.87 * sugar 

class AlcoholicDrink(Drink): 
    def __init__(self, alcohol, sugar): 
     super().__init__(sugar)  
     self.alcohol = alcohol 

    def numberOfCalories(self): 
     if self.alcohol > 0: 
      return self.alcohol * 7.0 + self.sugar 
     else: 
      super().numberOfCalories() 

choice = input('What would you like to drink?(Drink or AlcoholicDrink) ') 

if (choice == 'AlcoholicDrink'): 

    sugar = float(input('How much sugar is in your drink? ')) 
    alcohol = float(input('How much alcohol is in your drink? ')) 
    userDrink = AlcoholicDrink(sugar, alcohol) 

elif (choice == 'Drink'): 

    sugar = float(input('how much sugar is in your drink? ')) 
    userDrink = Drink(sugar) 

print ('Your amount of calories are ' + (userDrink.numberOfCalories())) 

Answer 1

對於'str' object is not callable錯誤：你有class Drink，然後分配Drink = input(...)。後者覆蓋前者。 Python對函數，類和字符串沒有單獨的桶。使用唯一的變量名稱來避免這個問題。

對於Can't convert 'float' object to str implicitly錯誤：最後print()呼叫試圖來連接（與+）一個str，'Your amount of calories are '，具有float，userDrink.numberOfCalories()。您有這幾個選項：

轉換的float到str：

print('Your amount of calories are ' + str(userDrink.numberOfCalories())) 

多個參數傳遞給print()電話：

print('Your amount of calories are', userDrink.numberOfCalories()) 

使用字符串格式化：

print('Your amount of calories are {}'.format(userDrink.numberOfCalories())) 

使用舊字符串格式（不推薦d，因爲它有利於新的字符串格式化的棄用以上）：

print('Your amount of calories are %f' % userDrink.numberOfCalories()) 

Answer 2

你用同名的局部變量隱藏了Drink類。使該行

Drink = input('What would you like to drink?(Drink or AlcoholicDrink) ') 

到

choice = input('What would you like to drink?(Drink or AlcoholicDrink) ') 

，並相應地改變所有其它參考文獻：

if (choice == 'AlcoholicDrink'): 

    sugar = float(input('How much sugar is in your drink? ')) 
    alcohol = float(input('How much alcohol is in your drink? ')) 
    userDrink = AlcoholicDrink(sugar, alcohol) 

elif (choice == 'Drink'): 

    sugar = float(input('how much sugar is in your drink? ')) 
    userDrink = Drink(sugar) 

print ('Your amount of calories are ' + (userDrink.numberOfCalories())) 

Answer 3

小心，你的「喝」變量實際上是引用您之前創建的類飲料。常規變量以小寫字母開頭，類別以大寫字母開頭。採用這些約定可以幫助您避免將來出現類似問題。

將此更改爲其他名稱將有助於解決您的問題！

閱讀更多蟒蛇約定：

Proper Python Conventions