비 Int 파이썬으로 시퀀스를 곱할 수 없다

Question

number_of_people = input("Enter number of people attending the picnic: ") 
if number_of_people.isnumeric(): 

    number_of_donuts = input("Enter number of donuts each person will want: ") 
    if number_of_donuts.isnumeric(): 

     min_box = (number_of_people * number_of_donuts) // 12 
     box_remainder = (number_of_people * number_of_donuts) % 12 
     if box_remainder != 0: 
      min_box = min_box + 1 

     print("Minimum boxes of donuts needed: ", min_box) 

     donuts_left = (min_box * 12) - (number_of_people * number_of_donuts) 
     print("Donuts left over:", donuts_left) 

     if min_box <= 5: 
      donut_cost = 8 * min_box 
     elif min_box <= 20: 
      donut_cost = 7.50 * min_box 
     else: 
      donut_cost = 6 * min_box 

     print ("Donuts cost: ",format(donut_cost, '.2f')) 

    else: 
     print(number_of_donuts, "is not a valid number") 

else: 
    print (number_of_people, "is not a valid number") 

나는 정말로 혼란 스럽다. 나는 사람들에게 그들이 잘못된 입력을하고 있다고 말할 수 있기를 원하지만 입력을 int (입력)로 변경하면 int를 넣지 않으면 사용자에게 알려주는 방법을 모른다.

오류 내가받을 형식 오류 : 타입 'STR'

Answer 1

의 비 INT에 의해 순서를 곱 수 없습니다 나는 문제는이 라인에 가정

donuts_left = (min_box * 12) - (number_of_people * number_of_donuts) 

나는 문제가있다 생각 number_of_people 및 number_of_donuts은 두 문자열이지만 숫자를 다루는 것이 좋습니다.

다음을 시도해보십시오.

number_of_people = input("Enter number of people attending the picnic: ") 
if number_of_people.isnumeric(): 
    number_of_people = int(number_of_people) 

    number_of_donuts = input("Enter number of donuts each person will want: ") 
    if number_of_donuts.isnumeric(): 
     number_of_donuts = int(number_of_donuts) 

     min_box = (number_of_people * number_of_donuts) // 12 
     box_remainder = (number_of_people * number_of_donuts) % 12 
     if box_remainder != 0: 
      min_box = min_box + 1 

     print("Minimum boxes of donuts needed: ", min_box) 

     donuts_left = (min_box * 12) - (number_of_people * number_of_donuts) 
     print("Donuts left over:", donuts_left) 

     if min_box <= 5: 
      donut_cost = 8 * min_box 
     elif min_box <= 20: 
      donut_cost = 7.50 * min_box 
     else: 
      donut_cost = 6 * min_box 

     print ("Donuts cost: ",format(donut_cost, '.2f')) 

    else: 
     print(number_of_donuts, "is not a valid number") 

else: 
    print (number_of_people, "is not a valid number")