我没有任何错误，我的循环一直在运行。 我究竟做错了什么？

Question

我正在尝试制作一个循环来检测用户何时吃够了食物。 这段代码对我来说很有意义，但显然是错误的。 我觉得这与从 int 到 str 的转换有关，反之亦然，但我不确定。

food = 0
tries = 0
while food < 10 and tries < 3:

  food = food + int(input("How much food would you like to eat?: "))
  print("You've eaten " + str(food) + " amounts of food.")
  tries += 1
  food = food + int(input("It's not enough food. How much more would you like to eat?: "))
  print("You've eaten " + str(food) + " amounts of food.")
  tries += 1
  food = food + int(input("It's still not enough. You have one more chance to eat. How much more?: "))
  print("You've eaten " + str(food) + " amounts of food.")
  tries += 1
  print("It's too late. You're dead")
else:
  print("You've eaten enough food.")

Answer 1

您没有循环，但有一个输入序列：

food = 0
food = food + int(input("How much food would you like to eat?: "))
print(f"You've eaten {food} amounts of food.")
if food < 10:
    food = food + int(input("It's not enough food. How much more would you like to eat?: "))
    print(f"You've eaten {food} amounts of food.")
    if food < 10:
        food = food + int(input("It's still not enough. You have one more chance to eat. How much more?: "))
        print(f"You've eaten {food} amounts of food.")
        if food < 10:
            print("It's too late. You're dead")
if food >= 10:
    print("You've eaten enough food.")

您可以使用 for 循环将其转换为对输入文本的循环：

food = 0
for text in [
    "How much food would you like to eat?: ",
    "It's not enough food. How much more would you like to eat?: ",
    "It's still not enough. You have one more chance to eat. How much more?: ",
]:
    food += int(input(text))
    print(f"You've eaten {food} amounts of food.")
    if food >= 10:
        print("You've eaten enough food.")
        break
else:
    print("It's too late. You're dead")

Answer 2

当用户输入非数字字符时会出现此问题。 由于int方法不过滤字符串，因此您需要手动执行此操作。 按照@Daniel 的代码，我在代码中添加了过滤。 这是带有实际循环的工作代码：

food = 0

def filterNonNumChars(input):
  input = str(input)
  allowedChars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
  output = ""
  for i in range(0, len(input)):
      if input[i] in allowedChars:
        output += input[i]

  return output

for text in [
    "How much food would you like to eat?: ",
    "It's not enough food. How much more would you like to eat?: ",
    "It's still not enough. You have one more chance to eat. How much more?: ",
]:
    food += int(filterNonNumChars(input(text)))
    print(f"You've eaten {food} amounts of food.")
    if food >= 10:
        print("You've eaten enough food.")
        break
else:
    print("It's too late. You're dead")

Answer 3

不确定你的循环的逻辑。 “while ... else ...”并不常见和清晰，可以用“while”和“if”代替，逻辑清晰。

food = 0
tries = 0
while food < 10 and tries < 3:
  food = food + int(input("How much food would you like to eat?: "))
  print("You've eaten " + str(food) + " amounts of food.")
  tries += 1
  food = food + int(input("It's not enough food. How much more would you like to eat?: "))
  print("You've eaten " + str(food) + " amounts of food.")
  tries += 1
  food = food + int(input("It's still not enough. You have one more chance to eat. How much more?: "))
  print("You've eaten " + str(food) + " amounts of food.")
  tries += 1
  print("It's too late. You're dead")

if (food >= 10 or tries >= 3):
  print("You've eaten enough food.")

你可以参考这里