python学生成绩管理系统创建
python学生成绩管理系统创建
要求编写学生类，班级类，并在电脑运行生成表单，输入一个数字，得到对应的结果。
输出样式
代码如下
学生类
class Student:
def __init__(self,sno,name,english,math):
self.sno=sno
self.name=name
self.__english=english
self.__math=math
@property
def english(self):
return self.__english
@english.setter
def english(self,english):
self.__english=english if 0<=english<=100 else 0
@property
def math(self):
return self.__math
@math.setter
def math(self,math):
self.__math=math if 0<=math<=100 else 0
def get_average(self):
return (self.english+self.math)/2
def __str__(self):
s=str.format('{0:>4d}{1: >4s}{2:>8d}{3:>8d}',self.sno,self.name,self.english,self.math)
return s
@staticmethod
def get_header():
return '{0:>2s}{1: >4s}{2:\u3000>4s}{3: >4s}'.format('学号','姓名','英语','数学')
def __eq__(self,other):
return self.sno==other.sno
def __gt__(self,other):
return self.sno>other.sno
测试
#测试
if __name__=='__main__':
s1=Student(1,'王大海',100, 65)
s2=Student(2,'李三',38,45)
s3=Student(3,'李四',88,45)
print(s1>s2)
students=[s2,s1,s3]
students.sort()
print(students)
print(Student.get_header())
for s in students:
print(s)
结果
班级类
from student import Student
class BanJi:
def __init__(self,name):
self.name=name
self.students=[]
self.load_data()
def load_data(self):
with open('data.txt','r')as f:
for line in f:
d=line.split()
self.students.append(Student(int(d[0]),d[1],int(d[2]),int(d[3])))
def show_student(self):
print(Student.get_header())
for s in self.students:
print(s)
def add_student(self,student):
if student in self.students:
return '此学生已存在'
else:
self.students.append(student)
return'添加成功'
def __index_student(self,sno):
s=Student(sno,'',0,0)
if s not in self.students:
return None
else:
return self.students.index(s)
def find_student(self,sno):
i = self.__index_student(sno)
if i is None:
return None
else:
return self.students[i]
def delete_student(self,sno):
i = self.__index_student(sno)
if i is None:
r = '没有学号为{0: d}'.format(sno)
else:
del self.students[i]
r = '删除成功！'
return r
def update_student(self,sno):
s = self.find_student(sno)
if s is None:
return '没有学号为{0：d}的学生！'.format(sno)
else:
print(s)
print('请输入新的值，直接回车不修改！')
name_str = input('姓名：')
english_str = input('英语：')
math_str = input('数学：')
s.name = name_str if len(name_str)>0 else s.name
s.name = int(english_str) if len(english_str)>0 else s.english
s.name = int(math_str) if len(math_str)>0 else s.math
return '修改成功！'
def save_data(self):
with open('data.txt','w',encoding = 'GBK') as f:
for s in self.students:
r = str.format('{0:d} {1:s} {2:d} {3:d}\n',s.sno,s.name,s.english,s.math)
f.write(r)
def sort_by_english(self,reverse = False):
self.students.sort(key=lambda x: x.english,reverse = reverse)
学生管理系统
import os
from student import Student
from banji import BanJi
menu = """
*********************
学生成绩管理系统
1.浏览学生成绩
2.按学号查找学生
3.按英语成绩排序
4.添加学生
5.删除学生
6.修改学生信息
9.保存
0.退出
*********************
"""
tip = '输入（0-9）选择操作：'
choice = ''
b = BanJi('1802')
os.system('cls')
print(menu)
while True:
choice = input(tip)
os.system('cls')
print(menu)
if choice == '0':
print('数据以保存！')
break
elif choice == '1':
b.show_student()
elif choice == '2':
sno = int(input('请输入您需要查询的学生的学号：'))
s = b.find_student(sno)
if s is None:
print('无此学号的学生！')
else:
print(s)
elif choice == '3':
b.sort_by_english()
b.show_student()
elif choice == '4':
print('请输入学生信息：')
sno = int(input('学号：'))
name = input('姓名：')
english = int(input('英语：'))
math = int(input('数学：'))
student = Student(sno,name,english,math)
r = b.add_student(student)
print(r)
elif choice == '5':
sno = int(input('请输入要删除的学生的学号：'))
r = b.delete_student(sno)
print(r)
elif choice == '6':
sno = int(input('请输入要修改的学生的学号：'))
r = b.update_student(sno)
print(r)
elif choice == '9':
b.save_data()
print('保存成功！')
else:
print('输入错误！')
用spyder或者cmd运行都可以。