python程序给出错误（分数背包问题）

Question

python的分数背包问题当我运行代码时它给出了一个错误，是分割函数不适用于整数值。

Traceback (most recent call last):
  File "C:/Users/Akshay/Desktop/python/kapsack_problem.py", line 49, in <module>
    .format(n)).split()
  File "<string>", line 1
    60 100 120
         ^
SyntaxError: invalid syntax 

这是使用贪婪算法解决分数背包问题的Python程序的源代码。我做错了请告诉我。提前致谢。

def fractional_knapsack(value, weight, capacity):

    index = list(range(len(value)))
    # contains ratios of values to weight
    ratio = [v/w for v, w in zip(value, weight)]
    # index is sorted according to value-to-weight ratio in decreasing order
    index.sort(key=lambda i: ratio[i], reverse=True)

    max_value = 0
    fractions = [0]*len(value)
    for i in index:
        if weight[i] <= capacity:
            fractions[i] = 1
            max_value += value[i]
            capacity -= weight[i]
        else:
            fractions[i] = capacity/weight[i]
            max_value += value[i]*capacity/weight[i]
            break

    return max_value, fractions


n = int(input('Enter number of items: '))
value = input('Enter the values of the {} item(s) in order: '
              .format(n)).split()
value = [int(v) for v in value]
weight = input('Enter the positive weights of the {} item(s) in order: '
               .format(n)).split()
weight = [int(w) for w in weight]
capacity = int(input('Enter maximum weight: '))

max_value, fractions = fractional_knapsack(value, weight, capacity)
print('The maximum value of items that can be carried:', max_value)
print('The fractions in which the items should be taken:', fractions)

Answer 1

您似乎尝试使用Python 2.x解释器运行此代码，而您的代码是用Python 3编写的。为了能够运行它，您需要检查您的机器上是否安装了Python 3（有关安装说明，请参阅here）。 要运行它，请运行

python3 my_script.py

在一个终端。 另一种可能性是粘贴

#!/usr/bin/env python3

在你的python脚本的顶部。然后，如果你使文件可执行（例如通过在ubuntu上运行chmod +x myscript.py），你可以简单地运行它

./my_script.py