Creating nested subdict python

Do not forget to use ' when you are defining your inputs:

students_exam_names = ['exam_name1', 'exam_name2', 'exam_name3']
students_exam_score = ['exam_score1', 'exam_score2', 'exam_score3']
students_quiz_names = ['quiz_name1', 'quiz_name2']
students_quiz_score = ['quiz_score1', 'quiz_score2']
students_homework_names = ['homework_name1', 'homework_name2', 'homework_name3', 'homework_name4']
students_homework_score = ['homework_score1', 'homework_score2', 'homework_score3', 'homework_score4']

Then, simply use the zip function:

details = {'students_exam': dict(zip(students_exam_names, students_exam_score)),
           'students_quiz': dict(zip(students_quiz_names, students_quiz_score)),
           'students_homework': dict(zip(students_homework_names, students_homework_score))}

The output is:

{'students_exam': {'exam_name1': 'exam_score1', 'exam_name2': 'exam_score2', 'exam_name3': 'exam_score3'}, 'students_quiz': {'quiz_name1': 'quiz_score1', 'quiz_name2': 'quiz_score2'}, 'students_homework': {'homework_name1': 'homework_score1', 'homework_name2': 'homework_score2', 'homework_name3': 'homework_score3', 'homework_name4': 'homework_score4'}}

So what if i assume your complete set of inputs are like

students_exam_names = ['name1', 'name2', 'name3']
students_exam_score = ['score1', 'score2', 'score3']
students_quiz_names = ['name1', 'name2']
students_quiz_score = ['score1', 'score2']
students_homework_names = ['name1', 'name2', 'name3', 'name4']
students_homework_score = ['score1', 'score2', 'score3', 'score4'] 

if so then the following code should do the job.

details={}
details['students_exam']={sexam: students_exam_score[students_exam_names.index(sexam)] for sexam in students_exam_names}
details['students_quiz']={squiz: students_quiz_score[students_quiz_names.index(squiz)] for squiz in students_quiz_names}
details['students_homework']={shome: students_homework_score[students_homework_names.index(shome)] for shome in students_homework_names}

It looks like you need some functions to do these updates:

def update_exam(details, names, scores):
    results = {}
    for name,score in zip(names,scores):
        results[name]=score
    details['students_exam'] = results

def update_quiz(details, names, scores):
    results = {}
    for name,score in zip(names,scores):
        results[name]=score
    details['students_quiz'] = results

def update_homework(details, names, scores):
    results = {}
    for name,score in zip(names,scores):
        results[name]=score
    details['students_homework'] = results

details = {}
update_exam(details, students_exam_names, students_exam_score)
update_quiz(details, students_quiz_names, students_quiz_score)
update_homework(details, students_homework_names, students_homework_score)

But since the above functions only really differ in the text name of the key, they can be collapsed further:

def update(details, key, names, scores):
    results = {}
    for name,score in zip(names,scores):
        results[name]=score
    details[key] = results

details = {}

update(details,'students_exam', students_exam_names, students_exam_score)
update(details,'students_quiz', students_quiz_names, students_quiz_score)
update(details,'students_homework', students_homework_names, students_homework_score)

And then the loop can become a dictionary comprehension:

def update(details, key, names, scores):
    details[key] = {name:score for (name,score) in zip(names,scores)}