Question

我一直在研究这段代码。它一直这么说：

Traceback (most recent call last):

  File "N:\Computing\Meal Generator.py", line 30, in <module>
    print(DaysOfTheWeek[0+counter],": ",Meals[random_meal]," and a number of ",NumberOfSides[random_meal],".")

TypeError: unsupported operand type(s) for +: 'int' and 'str'

以下是显示此错误的代码，任何帮助都会非常有用。

import random
random.seed()


Meals=[]
SideDishes=[]
DaysOfTheWeek=["Mon","Tue","Wed","Thu","Fri","Sat","Sun"]
print("1=Meal, 2=Side, 3=Finished")
option=input("What would you like to do?: ")
while option!=3:
    if option=="1":
        MealName=input("What meal would you like to add?: ")
        NumberOfSides=input("How many sides would you like have with the meal?: ")
        Meals=Meals,MealName,NumberOfSides
    if option=="2":
        SideName=input("What side would you like to add?: ")
        SideDishes+=SideName
    print("1=Meal, 2=Side, 3=Finished")
    try_again=input("What else would you like to do?: ")
    if try_again=="1":
        option="1"
    elif try_again=="2":
        option="2"
    else:
        break
print("Printing out meals for you")
counter=1
for counter in DaysOfTheWeek:
    random_meal=random.randint(0,len(Meals)-1)
    random_side=random.randint(0,len(SideDishes)-1)
    print(DaysOfTheWeek[0+counter],": ",Meals[random_meal]," and a number of ",NumberOfSides[random_meal],".")
    print("And the the side that will be served with will be: ",SideDishes[random_side])
    counter+=1
print("Thanks for using the Meal-O-Matic")

感谢您的帮助。 Tinymantwo

Answer 1

你误解了循环在Python中是如何工作的。

当您执行for counter in DaysOfTheWeek时，counter会依次从DaysOfTheWeek获取每个值。这意味着第一次它将是＆＃34; Mon＆＃34;，然后＆＃34; Tue＆＃34;等等。因此，当您尝试将其添加到0时，它会因该错误而失败。

但你不应该把它添加到任何东西：这就是重点。相反，这样做：

for day in DaysOfTheWeek:
    ...
    print(day, ": ", Meals[random_meal]," and a number of ",NumberOfSides[random_meal],".")

并且您不需要counter=0或counter+=1。

Answer 2

你像使用Javascript程序员一样使用Python：）

请阅读这些内容如何适用于Python，一些提示：

for counter in ["asdf", "bla"]遍历列表的条目，而不是列表索引，因此counter将为"asdf"和"bla"
input会返回一个字符串，因此while option != 3对您没有多大帮助

膳食发生器错误

2 个答案: