分类： Python/Ruby
2023-01-05 16:53:53
import os
class Student:
def __init__(self,no,name,chinese,math,english):
self.no = no
self.name = name
self.chinese = int(chinese)
self.math = int(math)
self.english = int(english)
class StudentList:
def __init__(self):
self.stulist = []
def show(self):
#显示学生信息
print('{:8}\t{:8}\t{:8}\t{:8}\t{:8}'
.format('学号','姓名','语文','数学','英语'))
for stu in self.stulist:
print('{:8}\t{:8}\t{:<8}\t{:<8}\t{:<8}'
.format(stu.no,stu.name,stu.chinese,stu.math,stu.english))
def __enterScore(self,message):
#成绩输入
while True:
try:
score = input(message)
if 0 <= int(score) <= 100:
break
else:
print("输入错误，成绩应在0到100之间")
except:
print("输入错误，成绩应在0到100之间")
return score
def __exists(self,no):
#判断学号是否存在
for stu in self.stulist:
if stu.no == no:
return True
else:
return False
def insert(self):
#添加学生信息
while True:
no = input('学号:')
if self.__exists(no):
print('该学号已存在')
else:
name = input('姓名:')
chinese = self.__enterScore('语文成绩:')
math = self.__enterScore('数学成绩:')
english = self.__enterScore('英语成绩:')
stu = Student(no,name,chinese,math,english)
self.stulist.append(stu)
choice = input('继续添加(y/n)?').lower()
if choice == 'n':
break
def delete(self):
#删除学生信息
while True:
no = input('请输入要删除的学生学号:')
for stu in self.stulist[::]:
if stu.no == no:
self.stulist.remove(stu)
print('删除成功')
break
else:
print('该学号不存在')
choice = input('继续删除(y/n)?').lower()
if choice == 'n':
break
def update(self):
#修改学生信息
while True:
no = input('请输入要修改的学生学号:')
if self.__exists(no):
for stu in self.stulist:
if stu.no == no:
stu.name = input('姓名:')
stu.chinese = int(self.__enterScore('语文成绩:'))
stu.math = int(self.__enterScore('数学成绩:'))
stu.english = int(self.__enterScore('英语成绩:'))
print('修改成功')
break
else:
print('该学号不存在')
choice = input('继续修改(y/n)?').lower()
if choice == 'n':
break
def load(self,fn):
#导入学生信息
if os.path.exists(fn):
try:
with open(fn,'r',encoding = 'utf-8') as fp:
while True:
fs = fp.readline().strip('\n')
if not fs:
break
else:
stu = Student(*fs.split(','))
if self.__exists(stu.no):
print('该学号已存在')
else:
self.stulist.append(stu)
print('导入完毕')
except:
print('error...') #要导入的文件不是utf-8编码，或是字段数不匹配等
else:
print('要导入的文件不存在')
def save(self,fn):
#导出学生信息
with open(fn,'w',encoding = 'utf-8') as fp:
for stu in self.stulist:
fp.write(stu.no + ',')
fp.write(stu.name + ',')
fp.write(str(stu.chinese) + ',')
fp.write(str(stu.math) + ',')
fp.write(str(stu.english) + '\n')
print("导出完毕")
def scoreavg(self):
#求课程平均分
length = len(self.stulist)
if length > 0:
chinese_avg = sum([stu.chinese for stu in self.stulist])/length
math_avg = sum([stu.math for stu in self.stulist])/length
english_avg = sum([stu.english for stu in self.stulist])/length
print('语文成绩平均分是:%.2f'%chinese_avg)
print('数学成绩平均分是:%.2f'%math_avg)
print('英语成绩平均分是:%.2f'%english_avg)
else:
print('尚没有学生成绩...')
def scoremax(self):
#求课程{BANNED}最佳高分
if len(self.stulist) > 0:
chinese_max = max([stu.chinese for stu in self.stulist])
math_max = max([stu.math for stu in self.stulist])
english_max = max([stu.english for stu in self.stulist])
print('语文成绩{BANNED}最佳高分是:%d'%chinese_max)
print('数学成绩{BANNED}最佳高分是:%d'%math_max)
print('英语成绩{BANNED}最佳高分是:%d'%english_max)
else:
print('尚没有学生成绩...')
def scoremin(self):
#求课程{BANNED}最佳低分
if len(self.stulist) > 0:
chinese_min = min([stu.chinese for stu in self.stulist])
math_min = 跟单网gendan5.commin([stu.math for stu in self.stulist])
english_min = min([stu.english for stu in self.stulist])
print('语文成绩{BANNED}最佳低分是:%d'%chinese_min)
print('数学成绩{BANNED}最佳低分是:%d'%math_min)
print('英语成绩{BANNED}最佳低分是:%d'%english_min)
else:
print('尚没有学生成绩...')
def infoprocess(self):
#基本信息管理
print('学生基本信息管理'.center(20,'-'))
print('load----------导入学生信息')
print('insert--------添加学生信息')
print('delete--------删除学生信息')
print('update--------修改学生信息')
print('show----------显示学生信息')
print('save----------导出学生信息')
print('return--------返回')
print('-'*28)
while True:
s = input('info>').strip().lower()
if s == 'load':
fn = input('请输入要导入的文件名:')
self.load(fn)
elif s == 'show':
self.show()
elif s == 'insert':
self.insert()
elif s == 'delete':
self.delete()
elif s == 'update':
self.update()
elif s == 'save':
fn = input('请输入要导出的文件名:')
self.save(fn)
elif s =='return':
break
else:
print('输入错误')
def scoreprocess(self):
#学生成绩统计
print('学生成绩统计'.center(24,'='))
print('avg --------课程平均分')
print('max --------课程{BANNED}最佳高分')
print('min --------课程{BANNED}最佳低分')
print('return --------返回')
print(''.center(30,'='))
while True:
s = input('score>').strip().lower()
if s == 'avg':
self.scoreavg()
elif s == 'max':
self.scoremax()
elif s == 'min':
self.scoremin()
elif s == 'return':
break
else:
print('输入错误')
def main(self):
#主控函数
while True:
print('学生信息管理系统V1.0'.center(24,'='))
print('info -------学生基本信息管理')
print('score -------学生成绩统计')
print('exit -------退出系统')
print(''.center(32,'='))
s = input('main>').strip().lower()
if s == 'info':
self.infoprocess()
elif s == 'score':
self.scoreprocess()
elif s == 'exit':
break
else:
print('输入错误')
if __name__ == '__main__':
st = StudentList()
st.main()
