Question

我正在尝试检查输入的几种情况，然后将字符串转换为整数，此后，我要确保整数不是负数，否则提示用户再次输入。

它适用于字符串条件，但是当我输入一个负数时，输入会引发错误“输入最多应有1个参数，得到2个”

有关如何对此进行评估的任何想法？

     #This compares whether the bet placed is greater than the value in the players chip_balance. It prompts the player for a lower bet if it is of greater value than chip_balance
 while bet > chip_balance:
      print('Sorry, you may only bet what you have 0 -', chip_balance)
      bet = input("Place your bet: ")
      while bet == '':
          bet = input("Can't be an empty bet please try again ")
      while bet.isalpha() or bet == '':
          bet = input("Must be a numerical value entered \n \n Place You're bet:")

      bet = int(bet)
 if bet < 0:
      bet = input("Sorry, you may only bet what you have sir! 0 \-", chip_balance)

      bet = int(bet)

Answer 1

sh4dowb已经识别出您的错误-您为to input([prompt])提供了2个参数-该参数仅接受1个文本输入作为提示。

除此之外，还有很多改进的空间：

您可以使用error handling进行验证。 string formating也派上用场：

从ValueError派生两个自定义错误-如果验证无法解决，我们将提出它们。

class ValueTooLowError(ValueError):
    """Custom error. Raised on input if value too low."""
    pass

class ValueTooHighError(ValueError):
    """Custom error. Raised in input if value too high."""
    pass

代码：

chip_balance = 22

while True:
    bet = input("Place your bet  (0-{}): ".format(chip_balance))

    try:
        bet = int(bet) # raises a ValueError if not convertable to int

        # bet is an int, now we do custom validation
        if bet < 0: 
            raise ValueTooLowError()
        elif bet > chip_balance: 
            raise ValueTooHighError()

        # bet is fine, break from the `while True:` loop
        break          

    except ValueTooLowError:
        print("Can not bet negative amounts of '{}'.".format(bet))

    except ValueTooHighError:
        print("You do not own that much credit! You got {}.".format(chip_balance))       

    except ValueError as e:
        if bet == "":
            print("You are the silent type? Be sensible: input a number.")
        else:
            print("Try again.")

print("You betted: {}".format(bet))

输出（行距）：

Place your bet  (0-22): -30
Can not bet negative amounts of '-30'.

Place your bet  (0-22): 55
You do not own that much credit! You got 22.

Place your bet  (0-22): # nothing
You are the silent type? Be sensible: input a number.

Place your bet  (0-22): 9  
You betted: 9

建议阅读：

Asking the user for input until they give a valid response

Answer 2

@GetMapping("/listcustomers")
public List<Customers> getCustomers(){
return customerService.findAll();
}

输入函数不带2个参数，而打印则带2个参数。您可以这样操作；

bet = input("Sorry, you may only bet what you have sir! 0 \-", chip_balance)

在Python中处理负整数的问题

2 个答案: