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计算班级学生和班级的平均成绩
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#!/usr/bin/python3                                                                                                                 #!/usr/bin/python3                                                                                                                     # -*- coding: utf-8 -*-"""# Author: EricRay# Created Time : 2017-11-20 15:17:10# File Name: dic1.py# Description:计算学生平均成绩和班级平均成绩"""#学生信息lloyd = {   "name": "Lloyd",  "homework": [90.0, 97.0, 75.0, 92.0],  "quizzes": [88.0, 40.0, 94.0],  "tests": [75.0, 90.0]}alice = {   "name": "Alice",  "homework": [100.0, 92.0, 98.0, 100.0],  "quizzes": [82.0, 83.0, 91.0],  "tests": [89.0, 97.0]}tyler = {   "name": "Tyler",  "homework": [0.0, 87.0, 75.0, 22.0],  "quizzes": [0.0, 75.0, 78.0],  "tests": [100.0, 100.0]}#计算平均成绩def average(numbers):    total = float(sum(numbers))/len(numbers)    return total#按比例进行计算def get_average(student):      homework = average(student["homework"])      quizzes = average(student["quizzes"])      tests = average(student["tests"])      return 0.1 * homework + 0.3 * quizzes + 0.6 * tests#等级判定def get_letter_grade(score):    if score >= 90:        return "A"    elif score >= 80:        return "B"    elif score >= 70:        return "C"    elif score >= 60:        return "D"    else:        return "F"#测试lloydprint (get_letter_grade(get_average(lloyd)))#班级平均成绩计算def get_class_average(class_list):    results = []   #用于返回结果    for student in class_list:        student_avg = get_average(student)        results.append(student_avg)        return average(results)                                                                                                        #参与计算的学生students = [lloyd, alice, tyler]class_avg = get_class_average(students)#平均分数print (class_avg)#等级判定                                                                                                                              print (get_letter_grade(class_avg))