Python认为10小于9吗

Question

def greedyAdvisor(subjects, maxWork, comparator):
    '''subjects is a dictionary with keys classes and values of tuples of class value and class work. maxWork is the maximum work a student wants to put in. comparator is a function that takes two tuples of the aforementioned class value/class work variety and returns which one has a higher value. The function returns a dictionary with the most valuable classes to take within the given parameter of the willingness to work. I am supposed to use a greedy algorithem'''
    greedy_dict = {}
    highest_subjects = []
    total_work = 0
    while total_work < maxWork:
        highest_value = 0, 0
        highest_class = 0.0 
        for i in subjects:
            if comparator (subjects[i], highest_value) and i not in highest_subjects and total_work + int(subjects[i][WORK]) <= maxWork:
                highest_value = subjects[i]
                highest_class = i
                print highest_class, highest_value
        highest_subjects.append(highest_class)
        total_work += int(highest_value[WORK])
        greedy_dict[highest_class] = highest_value
    print greedy_dict

    return greedy_dict

这里的数据，subjects 是一个字典，它把课程，比如 6.00、7.01 等，映射到一个元组上，元组里有两个值：一个是课程的分数，范围是 1 到 10；另一个是工作量，范围是 1 到 20，表示完成这个问题大概需要多少小时。最开始这些数据是在一个文本文件里，我把它转换成了字典，做得还不错。这个问题来自麻省理工学院的编程入门课程第八个问题，文本内容在一个叫 subjects.txt 的文件里。我希望这能解决你对数据的疑问。

我遇到的问题是，subjects 字典里的课程分数最大可以到 10，但 greedy_dictionary 却一直认为最大值是 9。参数里的比较器是一个函数，如果第一个元组的分数大于第二个元组的分数，它就返回 True。

Answer 1

如果你是在比较字符串的话，那就是这样。

>>> '10' < '9'
True

先试着把它们转换成数字再说。