Python课程设计 第 21 / 52 篇
类与对象-参考答案
程序设计：
学生成绩管理系统
1.根据姓名查看学生所有成绩
2.查看所有人的某学科成绩
3.查看总平均分
4.查看某人的某学科成绩
5.根据姓名删除学生信息
增强版要求(选做)
1.首先编写json格式的数据文件 内容为学生
2.将json数据解析后转换为学生对象在进行增删改查设计思路解析参考：
"""
学生成绩管理系统
1.根据姓名查看学生所有成绩
2.查看所有人的某学科成绩
3.查看总平均分
4.查看某人的某学科成绩
5.根据姓名删除学生信息
增强版要求(选做)
1.首先编写json格式的数据文件 内容为学生
2.将json数据解析后转换为学生对象在进行增删改查
"""
# 基本版本
class StudentsScore:
def __init__(self, student_dict):
self.student_dict = student_dict
# 1.根据姓名查看学生所有成绩
def check_score(self, name):
# if name in self.student_dict:
# return self.student_dict[name]
# else:
# return
return self.student_dict.get(name)
# 2.查看所有人的某学科成绩
def check_all_score(self, subject):
name_score_dict = {}
for name, score_dict in self.student_dict.items():
name_score_dict[name] = score_dict[subject]
return name_score_dict
# 3.查看总平均分
def check_average(self):
sum_score = 0
subject_count = 0
for score_dict in self.student_dict.values():
for score in score_dict.values():
sum_score += score
subject_count += 1
return sum_score / subject_count
# 4.查看某人的某学科成绩
def check_some_score(self, name, subject):
# return self.student_dict[name][subject]
student_name = self.student_dict.get(name)
if student_name:
return student_name.get(subject)
else:
return '没有这个学生'
# 5.根据姓名删除学生信息
def drop_student_info(self, name):
if name in self.student_dict:
self.student_dict.pop(name)
return self.student_dict
else:
return '没有这个学生'
stu_dict = {
'Albert1': {'Chinese': 80, 'Math': 100, 'English': 95},
'Albert2': {'Chinese': 83, 'Math': 90, 'English': 99},
'Albert3': {'Chinese': 96, 'Math': 79, 'English': 98}
}
# 实例化对象
stu_score = StudentsScore(stu_dict)
# 1.根据姓名查看学生所有成绩
res1 = stu_score.check_score('Albert')
res2 = stu_score.check_score('Albert1')
print(res1)
print(res2)
# 2.查看所有人的某学科成绩
res3 = stu_score.check_all_score('Math')
res4 = stu_score.check_all_score('Chinese')
print(res3)
print(res4)
# 3.查看总平均分
res5 = stu_score.check_average()
print(res5)
# 4.查看某人的某学科成绩
res5 = stu_score.check_some_score('Albert', 'Math')
res6 = stu_score.check_some_score('Albert3', 'Math')
res7 = stu_score.check_some_score('Albert3', 'Chinese')
print(res5)
print(res6)
print(res7)
# 5.根据姓名删除学生信息
res8 = stu_score.drop_student_info('Albert')
res9 = stu_score.drop_student_info('Albert1')
print(res8)
print(res9)
# 增强版本
import json
import os
"""
学生成绩管理系统
1.根据姓名查看学生所有成绩
2.查看所有人的某学科成绩
3.查看总平均分
4.查看某人的某学科成绩
5.根据姓名删除学生信息
增强版要求(选做)
1.首先编写json格式的数据文件 内容为学生
2.将json数据解析后转换为学生对象在进行增删改查
"""
class StudentsScore:
def __init__(self, student_dict):
self.student_dict = student_dict
for name, score_dict in student_dict.items():
with open('%s.json' % name, 'w', encoding='utf-8') as f:
json.dump(score_dict, f)
f.flush()
# 1.根据姓名查看学生所有成绩
def check_score(self, name):
# # if name in self.student_dict:
# # return self.student_dict[name]
# # else:
# # return
# return self.student_dict.get(name)
user_path = '%s.json' % name
if os.path.exists(user_path):
with open(user_path, 'r', encoding='utf-8') as f:
user_dic = json.load(f)
return user_dic
else:
return
# 2.查看所有人的某学科成绩
def check_all_score(self, subject):
# name_score_dict = {}
# for name, score_dict in self.student_dict.items():
# name_score_dict[name] = score_dict[subject]
#
# return name_score_dict
name_score_dict = {}
path_list = os.listdir('/Users/mayite/Desktop/path01')
for name_path in path_list:
if name_path.endswith('json'):
with open(name_path, 'r', encoding='utf-8') as f:
student_score_dict = json.load(f)
name_score_dict[name_path[:-5]] = student_score_dict[subject]
return name_score_dict
# 3.查看总平均分
def check_average(self):
# sum_score = 0
# subject_count = 0
# for score_dict in self.student_dict.values():
# for score in score_dict.values():
# sum_score += score
# subject_count += 1
# return sum_score / subject_count
sum_score = 0
subject_count = 0
path_list = os.listdir('/Users/mayite/Desktop/path01')
for name_path in path_list:
if name_path.endswith('json'):
with open(name_path, 'r', encoding='utf-8') as f:
student_score_dict = json.load(f)
for score in student_score_dict.values():
sum_score += score
subject_count += 1
return sum_score / subject_count
# 4.查看某人的某学科成绩
def check_some_score(self, name, subject):
# # return self.student_dict[name][subject]
# student_name = self.student_dict.get(name)
# if student_name:
# return student_name.get(subject)
# else:
# return '没有这个学生'
path_list = os.listdir('/Users/mayite/Desktop/path01')
for name_path in path_list:
if name_path[:-5] == name:
with open(name_path, 'r', encoding='utf-8') as f:
student_score_dict = json.load(f)
return student_score_dict[subject]
else:
return '没有这个学生'
# 5.根据姓名删除学生信息
def drop_student_info(self, name):
# if name in self.student_dict:
# self.student_dict.pop(name)
# return self.student_dict
# else:
# return '没有这个学生'
path_list = os.listdir('/Users/mayite/Desktop/path01')
for name_path in path_list:
if name_path[:-5] == name:
os.remove(name_path)
return '删除成功', os.listdir('/Users/mayite/Desktop/path01')
else:
return '没有这个学生'
stu_dict = {
'Albert1': {'Chinese': 80, 'Math': 100, 'English': 95},
'Albert2': {'Chinese': 83, 'Math': 90, 'English': 99},
'Albert3': {'Chinese': 96, 'Math': 79, 'English': 98}
}
# 实例化对象
stu_score = StudentsScore(stu_dict)
# 1.根据姓名查看学生所有成绩
res1 = stu_score.check_score('Albert')
res2 = stu_score.check_score('Albert1')
print(res1)
print(res2)
# 2.查看所有人的某学科成绩
res3 = stu_score.check_all_score('Math')
res4 = stu_score.check_all_score('Chinese')
print(res3)
print(res4)
# 3.查看总平均分
res5 = stu_score.check_average()
print(res5)
# 4.查看某人的某学科成绩
res5 = stu_score.check_some_score('Albert', 'Math')
res6 = stu_score.check_some_score('Albert3', 'Math')
res7 = stu_score.check_some_score('Albert3', 'Chinese')
print(res5)
print(res6)
print(res7)
# 5.根据姓名删除学生信息
res8 = stu_score.drop_student_info('Albert')
res9 = stu_score.drop_student_info('Albert1')
print(res8)
print(res9)谈到根据姓名查看学生成绩，而学生可能会有多门课程，可以考虑用字典嵌套的方式去设计数据结构，删除字典的key也比较简单。