Question

我有一个实例，我想比较嵌套在另一本词典中的字典之间的数据。嵌套字典都具有相同的格式；看起来像这样：

students = {"student_1": {"id":1009, "first_name": "Alex", "last_name": "Robertson",
                          "Assignments":[("Assignment_1",3),("Assignment_2", 4),
                                         ("Assignment_3", 2), ("Assignment_4", 4)]},
            "student_2" :{"id":2009, "first_name": "Dave", "last_name": "Davidson",
                          "Assignments":[("Assignment_1",2),("Assignment_2", 1),
                                         ("Assignment_3", 2), ("Assignment_4", 4)]},
            "student_3" :{"id":3009, "first_name": "Hayden", "last_name": "Miles",
                          "Assignments":[("Assignment_1",1),("Assignment_2", 1),
                                         ("Assignment_3", 1), ("Assignment_4", 1)]},
            "student_4" :{"id":4009, "first_name": "Randy", "last_name": "Bacon",
                          "Assignments":[("Assignment_1",2),("Assignment_2", 2),
                                         ("Assignment_3", 2), ("Assignment_4", 4)]},
            "student_5" :{"id":5009, "first_name": "Katrina", "last_name": "Lopez",
                          "Assignments":[("Assignment_1",2),("Assignment_2", 1),
                                         ("Assignment_3", 2), ("Assignment_4", 3)]},
            "student_6" :{"id":6009, "first_name": "Tessa", "last_name": "Franklin",
                          "Assignments":[("Assignment_1",1),("Assignment_2", 4),
                                         ("Assignment_3", 2), ("Assignment_4", 4)]}}

我想做的是指定一个特定的作业（元组中的字符串），并抽出与该作业相关的所有六个年级，并将其与学生的ID号配对。例如，如果我要为Assignment_1评分，则结果将是一个具有ID和Assignment_1中的评分的元组列表，或者是student_＃的有序列表。非常感谢您的帮助，这就是我一直在尝试使用的方法：

def highest_n_grades(dict, tuple, int):
    save_data = []
    for d in dict:
     for k in d:
        if k == "Assignments":
            if [0] == tuple:
                data = d["id"],d["first_name"],d["last_name"],k[1]
                save_data.append(data)
    return save_data

代码会运行，但只会返回空括号。

Answer 1

您的if语句将始终为False，因为您正在将具有一个值的列表与字符串进行比较。

您可以这样尝试（假设“ tuple”是一个字符串）：

search_assignment = "Assignment_1"

def highest_n_grades(students, search_assignment):
    save_data = []
    for student in students:
        student_data = students[student]
        assignments = student_data["Assignments"]
        for assignment in assignments:
            if assignment[0] is search_assignment:
                data = (student_data["id"], student_data["first_name"], student_data["last_name"], assignment[1])
                save_data.append(data)

Answer 2

为了我的理解，我对您的代码做了一些修改。该代码提取给定作业的学生成绩。

def highest_n_grades(dict, tuple):
save_data = []
for d_id,d_info in dict.items():
    assignments = d_info['Assignments']
    for el in assignments:
        if el[0] == tuple:
            data = d_info["id"],d_info["first_name"],d_info["last_name"],el[1]
            save_data.append(data)
return save_data

用例：

highest_n_grades(students,'Assignment_1')

 [(1009, 'Alex', 'Robertson', 3),
 (2009, 'Dave', 'Davidson', 2),
 (3009, 'Hayden', 'Miles', 1),
 (4009, 'Randy', 'Bacon', 2),
 (5009, 'Katrina', 'Lopez', 2),
 (6009, 'Tessa', 'Franklin', 1)]

合并部分字典以进行比较

2 个答案: