在Python中循环访问字典值

Question

我有一个脚本，用于计算课程中所有学生的所有测验，作业和考试分数的平均值。然后，我想让它比较每个学生在每个项目上所做的与使用词典的项目的平均值相比的情况。我怎么能解决这个问题？

from __future__ import division 

def main(): 
    quiz_averages = quiz_average(remove_zeros([57,0,36,29,38,31,33,0,42,0,52,28,0,50,26,97,80,63,8,36,33,39,12,36,12,59,75,61,57,39,18,9,19,35,75,5,18,0,56,0,24,0,9], 
               [83,0,64,45,66,82,52,0,43,0,53,49,43,82,44,74,74,58,52,52,60,18,24,34,19,42,72,65,79,99,75,24,35,70,74,43,55,0,82,0,34,0,22], 
               [69,0,38,16,16,16,55,0,28,0,44.5,31,0,33,52,75,46,33,36,0,49,34.5,35,79.5,13,27,31,52,40.5,64.5,15,0,31,47,26,0,36,0,68,0,64.5,0,20], 
               [86,0,95,74,90,53,32,0,79,0,38,63,0,42,61,0,0,70,62,78,0,60,47,89,75,62,84,62,71,80,73,0,31,25,74,0,77,0,90,0,78,0,25])) 
    student_quiz_scores = {'John':[61,65,52,62],'Kate':[87,56,73,24],'Mike':[97,54,84,42],'Danielle':[39,100,35,75],'Roger':[78,65,37,42]} 
    print_quiz_averages(student_quiz_scores,quiz_averages) 

    homework_averages = homework_average(remove_zeros([74,70,62,98,70,83,24,70,87,14,67,80,93,72,65,90,23,43,95,53,66,98,100,95,82,88,91,90,55,64,71,86,66,89,38,88], 
                 [80,71,58,68,80,71,3,47,60,65,72,87,36,67,57,61,32,29,37,46,73,72,99,67,77,93,93,40,68,84,53,74,84,52], 
                 [44,25,62,85,77,80,45,80,70,25,80,73,53,56,82,70,67,36,46,82,85,40,85,42,64,84,80,58,63,73,84,89,87,55,82], 
                 [93,70.5,59,94,97,98.5,70,94,70.5,86,97.5,100,87,77.5,71,79,86,93.5,67,50,94,94,73.5,100,82,81,99.5,77.5,91.5,75.5,94,94,45,91.5], 
                 [93.5,65,71,96,96,95,78,96,96,76,94,91.5,48,74,96,75,95,49,89,94,95,98,96,62,61,94,68,91,96,80,61,93], 
                 [79,78,74,97.5,88,99.5,77,96,94,87.5,94,96.5,55,94,55,37,53,76.5,97,97.5,80,97.5,38,78,95.5,72,59,74,97.5,97.5,52,97.5], 
                 [82,88,43,87,68,100,82,92,81,90,100,100,85.5,94,51,74,54,95,94,89,95,77,59,94.5,72,72,32,94,90,90,97], 
                 [86.5,94,94,94.5,89,89,78,72,99,100,99.5,72,78,71.5,76,56,81,79,80,85.5,89,73,73.5,100,93,68,88,92,95,100,80.5])) 
    student_homework_scores = {'John':[95,99,85,100,96,97.5,95,89],'Kate':[88,97,86,78,41,81,94,96],'Mike':[89,88,81,85,99,57,69,100],'Danielle':[75,87,67,59,94,92,94,95],'Roger':[97,78,87,93,91,90,67,84]} 
    print_homework_averages(student_homework_scores,homework_averages) 

    exam_averages = exam_average(remove_zeros([85,80,85,77,83,67,55,75,79,76,72,59,89,87,73,85,78,84,69,75,84,52,85,76,84,90,85,84,80,76,86,75,89,71,64], 
              [85,89,76,76,85,83,82,83,78,60,79,80,91,86,78,75,93,81,53,80,83,79,73,78,83,77,92,91,77,73,86,77,88,48,73])) 
student_exam_scores = {'John':[84,83],'Kate':[93,78],'Mike':[85,73],'Danielle':[100,98],'Roger':[66,88]} 
print_exam_averages(student_exam_scores,exam_averages) 

def remove_zeros(*all_quizzes): 
    result = [] 
    for each_quiz in all_quizzes: 
     updated_quiz_list = [] 
     for number in each_quiz: 
      if number != 0: 
       updated_quiz_list.append(number) 
     result.append(updated_quiz_list) 
    return result 

def quiz_average(all_quizzes): 
    averages = [] 
    for each_quiz in all_quizzes: 
     each_average = find_average(each_quiz) 
     averages.append(each_average) 
    return averages 

def find_average(array): 
    for number in array: 
     average = sum(array)/len(array) 
    return average 

def print_quiz_averages(student_quiz_scores,the_averages): 
    count = 0 
    for i in the_averages: 
     print "The average for quiz",count+1,"is:",i 
     count+=1 
     if student_quiz_scores[count-1]>the_averages[count-1]: 
      print "You did", student_quiz_scores[count-1]-the_averages[count-1], "points higher than the average! :)\n" 
     else: 
      print "You did", the_averages[count-1]-student_quiz_scores[count-1], "points lower than the average! :(\n" 

def homework_average(all_homeworks): 
    averages = [] 
    for each_homework in all_homeworks: 
     each_average = find_average(each_homework) 
     averages.append(each_average) 
    return averages 

def print_homework_averages(student_homework_scores,the_averages): 
    count = 0 
    for i in the_averages: 
     print "The average for homework",count+1,"is:",i 
     count+=1 
     if student_homework_scores[count-1]>the_averages[count-1]: 
      print "You did", student_homework_scores[count-1]-the_averages[count-1], "points higher than the average! :)\n" 
     else: 
      print "You did", the_averages[count-1]-student_homework_scores[count-1], "points lower than the average! :(\n" 

def exam_average(all_exams): 
    averages = [] 
    for each_exam in all_exams: 
     each_average = find_average(each_exam) 
     averages.append(each_average) 
    return averages 

def print_exam_averages(student_exam_scores,the_averages): 
    count = 0 
    for i in the_averages: 
     print "The average for exam",count+1,"is:",i 
     count+=1 
     if student_exam_scores[count-1]>the_averages[count-1]: 
      print "You did", student_exam_scores[count-1]-the_averages[count-1], "points higher than the average! :)\n" 
     else: 
      print "You did", the_averages[count-1]-student_exam_scores[count-1], "points lower than the average! :(\n" 

if __name__ == '__main__': 
    main() 

Answer 1

呼应多少代码中有注释，但这里是你的功能之一重写，这样你就可以概括这对你对他人：

def print_quiz_averages(student_quiz_scores,the_averages):             
    for i, average in enumerate(the_averages):                
    print "The average for quiz",i+1,"is:",i 
    for student, student_data in student_quiz_scores.iteritems():          
     if student_data[i]>average: 
      print("{:s} did {:.2f}% higher than average\n".format(student, student_data[i]-average)) 
     else: 
      print("{:s} did {:.2f}% lower than average\n".format(student, -student_data[i]+average))