Codewars：解决 Kata - 最高和最低

Question

这应该可行，但在运行测试用例时出现错误。 出于某种原因，第四个失败了。 numbers[0] 打印出“-1”，但在分配给highest_number 或lowest_number 后，只打印出“-”。 是什么赋予了？

代码：

def high_and_low(numbers):
    if numbers:
        highest_number = numbers[0]
        lowest_number = numbers[0]
        numbers = numbers.split(" ")
        print(highest_number)
        print(lowest_number)
        print(numbers[0])
        for num in numbers:
            if int(num) > int(highest_number):
                highest_number = num
            if int(num) < int(lowest_number):
                lowest_number = num
        return highest_number + " " + lowest_number

测试用例：

Test.assert_equals(high_and_low("4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"), "542 -214");
Test.assert_equals(high_and_low("1 -1"), "1 -1");
Test.assert_equals(high_and_low("1 1"), "1 1");
Test.assert_equals(high_and_low("-1 -1"), "-1 -1");
Test.assert_equals(high_and_low("1 -1 0"), "1 -1");
Test.assert_equals(high_and_low("1 1 0"), "1 0");
Test.assert_equals(high_and_low("-1 -1 0"), "0 -1");
Test.assert_equals(high_and_low("42"), "42 42");

错误：

ValueError: invalid literal for int() with base 10: '-'

Answer 1

首先拆分您的数字，否则您只是将numbers的第一个字符分配给您的变量：

    numbers = numbers.split(" ")
    highest_number = numbers[0]
    lowest_number = numbers[0]

Answer 2

在这里试试这个！ 刚拿到，感觉好傻，可以加+号的字符串！

答案是：

def high_and_low(numbers):
  # must split the numbers, convert them to integers and print the max and min of list
  numbers = numbers.split()
  numbers = [int(i) for i in numbers]
  return str(max(numbers))+" "+str(min(numbers))

Answer 3

您可以使用此代码：

def high_and_low(numbers):
    nn = [int(s) for s in numbers.split(" ")]
    return "%i %i" % (max(nn),min(nn))

并做了