基于python的学生信息管理系统
源码
"""
Welcome to Python
Life is short , You need python
author: MX_INFO
version: 1.0
"""
import os
#文件路径
filename="student.txt"
#主菜单
def mainMenu():
while True:
menu()
choice=int(input("请选择："))
if choice in range(8):
if choice==0:
answer=input("你确定退出系统吗？y/n")
if answer=='y' or answer=='Y':
print("谢谢你的使用")
break
else:
continue
elif choice==1:
insert()
elif choice==2:
search()
elif choice==3:
delete()
elif choice==4:
modify()
elif choice==5:
sort()
elif choice==6:
total()
elif choice==7:
show()
else:
print("你的输入有误~~~")
#添加学生信息
def insert():
student_lst=[]
while True:
id=input("请输入学生ID：")
if not id:
break
name=input("请输入学生姓名：")
if not name:
break
try:
english=int(input("请输入英语成绩："))
java=int(input("请输入Java成绩："))
python=int(input("请输入python成绩："))
except:
print("输入无效，请重新输入~~")
continue
#将录入的学生信息保存到字典
stu={"id":id,"name":name,"english":english,"java":java,"python":python}
student_lst.append(stu)
answer=input("是否继续添加y/n：")
if answer=='y' or answer=='Y':
continue
else:
break
sava(student_lst)
print("学生信息录入完毕~~")
#将键盘输入信息存入磁盘
def sava(lst):
try:
stu_txt=open(filename,"a",encoding="utf-8")
except:
stu_txt = open(filename, "w", encoding="utf-8")
for item in lst:
stu_txt.write(str(item)+"\n")
stu_txt.close()
#查找学生信息
def search():
stu_query=[]
while True:
id=''
name=''
if os.path.exists(filename):
mode=input("按照ID查找请输入1，按照姓名查找请输入2:")
if mode=="1":
id=input("请输入学生ID：")
elif mode=='2':
name=input("请输入学生姓名：")
else:
print("您的输入有误，请重新输入")
search()
with open(filename,"r",encoding="utf-8") as rfile:
student=rfile.readlines()
for item in student:
d=dict(eval(item))
if id!='':
if d['id']==id:
stu_query.append(d)
elif name!='':
if d['name']==name:
stu_query.append(d)
show_student(stu_query)
stu_query.clear()
answer=input("是否继续查询y/n:")
if answer=='y' or answer=='Y':
continue
else:
break
else:
print("暂未保存学生信息")
return
#显示学生信息
def show_student(lst):
if len(lst)==0:
print("没有查询到学生信息，没有数据显示")
return
#定义标题显示格式
format_title="{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}"
print(format_title.format("ID","姓名","英语成绩","Java成绩","python成绩","总成绩"))
format_data = "{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}"
for item in lst:
print(format_data.format(item.get('id'),item.get('name'),item.get('english'),
item.get('java'),item.get('python'),
int(item.get('english'))+int(item.get('java'))+int(item.get("python"))
))
#删除学生信息
def delete():
while True:
stu_id=input("请输入要删除的学生ID：")
if stu_id != "":
if os.path.exists(filename):
with open(filename,"r",encoding="utf_8") as file:
stu_old=file.readlines()
else:
stu_old=[]
flag=False
if stu_old:
with open(filename,"w",encoding="utf-8") as wfile:
d={}
for item in stu_old:
d=dict(eval(item))
if d["id"] != stu_id:
wfile.write(str(d)+"\n")
wfile.flush()
else:
flag=True
wfile.close()
if flag:
print(f"id为{stu_id}的学生信息已经被删除")
else:
print(f"没有找到id为{stu_id}的学生信息")
else:
print("无学生信息")
break
show()
answer=input("是否继续删除y/n")
if answer=='y' or answer == 'Y':
continue
else:
break
#修改学生信息
def modify():
show()
if os.path.exists(filename):
with open(filename,"r",encoding="utf-8") as rfile:
student_old=rfile.readlines()
else:
return
stu_id=input("请输入你要修改的ID：")
with open(filename,"w",encoding="utf-8") as wfile:
for item in student_old:
d=dict(eval(item))
if d['id']==stu_id:
print("找到学生信息，可以修改他的相关信息了")
while True:
try:
d['name']=input("请输入姓名：")
d['english']=input("请输入英语成绩：")
d['java']=input("请输入Java成绩：")
d['python']=input("请输入python成绩")
except:
print("你的输入有误，请重新输入")
else:
break
wfile.write(str(d)+"\n")
print("修改成功")
else:
wfile.write(str(d) + "\n")
answer=input("是否继续修改其他学生的信息：")
if answer=='y' or answer=='Y':
modify()
else:
return
#按照成绩排序
def sort():
show()
if os.path.exists(filename):
with open(filename,"r",encoding="utf-8") as rfile:
stu_lst=rfile.readlines()
stu_new=[]
for item in stu_lst:
d=dict(eval(item))
stu_new.append(d)
else:
return
asc_or_desc=input("请选择 0.升序 1.降序")
if asc_or_desc==0:
asc_or_desc_boll=False
elif asc_or_desc==1:
asc_or_desc_bool = True
else:
print("你的输入有误，请重新输入")
sort()
mode=input("请选择排序方式(1.按英语成绩排序 2.按Java成绩排序 3.按python成绩排序 4.按总成绩排序)：")
if mode=="1":
stu_new.sort(key=lambda x : int(x['english']),reverse=asc_or_desc_bool)
elif mode=="2":
stu_new.sort(key=lambda x: int(x['java']), reverse=asc_or_desc_bool)
elif mode=="3":
stu_new.sort(key=lambda x: int(x['python']), reverse=asc_or_desc_bool)
elif mode=="4":
stu_new.sort(key=lambda x: int(x['english']) + int(x['java']) + int(x['python']), reverse=asc_or_desc_bool)
else:
print("你的输入有误，请重新输入")
sort()
show_student(stu_lst)
#显示总成绩
def total():
if os.path.exists(filename):
with open(filename,"r",encoding="utf-8") as rfile:
stu=rfile.readlines()
if stu:
print(f"一共有{len(stu)}名学生信息")
else:
print("还没有录入学生信息")
else:
print("暂未保存学生信息")
#显示学生信息
def show():
stu_list=[]
if os.path.exists(filename) :
with open(filename,"r",encoding="utf-8") as rfile:
students=rfile.readlines()
for item in students:
stu_list.append(eval(item))
if stu_list:
show_student(stu_list)
else:
print("暂未保存学生信息")
#退出
def exit():
pass
#主菜单
def menu():
print("====================学生信息管理系统====================")
print("----------------------功能菜单-------------------------")
print("\t\t\t\t\t1.录入学生信息")
print("\t\t\t\t\t2.查找学生信息")
print("\t\t\t\t\t3.删除学生信息")
print("\t\t\t\t\t4.修改学生信息")
print("\t\t\t\t\t5.排序")
print("\t\t\t\t\t6.统计学生总人数")
print("\t\t\t\t\t7.显示所有学生信息")
print("\t\t\t\t\t0.退出系统")
#函数入口
if __name__ == '__main__':
mainMenu()
