import os
filename='student.txt'
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")
def main():
while True:
menu()
choice=int(input('请选择:'))
if choice in [0,1,2,3,4,5,6,7]:
if choice==0:
answer=input('您确定要退出系统吗?y/n')
if answer=='y' or answer=='Y':
print('谢谢您的使用')
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()
def insert():
student_list=[]
while True:
id=input('请输入学生id(如1001):')
if id==False:
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:'))
python=int(input('请输入python成绩：'))
java=int(input('请输入java成绩：'))
except:
print('输入无效，不是整数类型,请重新输入')
continue
student={'id':id,'name':name,'english':english,'python':python,'java':java}
student_list.append(student)
answer=input('是否继续添加?y/n\n')
if answer=='y' or answer=='Y':
continue
else:
break
save(student_list)
print('学生信息录入完毕!!!')
def save(lst):
try:
stu_txt=open(filename,'a',encoding='utf-8')
except:
stu_txt=open(filename,'a',encoding='utf-8')
for item in lst:
stu_txt.write(str(item)+'\n')
stu_txt.close()
def search():
student_query=[]
while True:
id=''
name=''
if os.path.exists(filename):
mode=input('按ID查找请输入1，按姓名查找请输入2')
if mode=='1':
id=input('请输入学生的id')
elif mode=='2':
name=input('请输入学生的姓名')
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:
student_query.append(d)
elif name!='':
if d['name']==name:
student_query.append(d)
show_student(student_query)
student_query.clear()
answer=input('是否继续查询y/n\n')
if answer=='y':
continue
else:
break
else:
print('暂未保存学生信息')
return
def show_student(lst):
if len(lst)==0:
print('没查询到学生信息，无数据显示！！！')
return
format_title='{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
print(format_title.format('ID','姓名','英语成绩','python成绩','java成绩','总成绩'))
format_data='{:^6}\t{:^12}\t{:^8}\t{:^8}\t{:^8}\t{:^8}'
for item in lst:
print(format_data.format(item.get('id'),
item.get('name'),
item.get('english'),
item.get('python'),
item.get('java'),
int(item.get('english'))+int(item.get('python'))+int(item.get('java'))
))
def delete():
while True:
student_id=input('请输入要删除学生的id:')
if student_id!='':
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8') as file:
student_old=file.readlines()
else:
student_old=[]
flag=False
if student_old:
with open(filename,'w',encoding='utf-8') as wfile:
d={}
for item in student_old:
d=dict(eval(item))
if d['id']!=student_id:
wfile.write(str(d)+'\n')
else:
flag=True
if flag:
print(f'id为{student_id}的学生信息已被删除')
else:
print(f'没有找到ID为{student_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':
continue
else:
break
def modify():
show()
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8') as rfile:
student_old=rfile.readlines()
else:
return
student_id=input('请输入要修改学生的id:')
with open(filename,'w',encoding='utf-8') as wfile:
for item in student_old:
d=dict(eval(item))
if d['id']==student_id:
print('找到学生信息，可以修改')
while True:
try:
d['name']=input('请重新输入姓名：')
d['english']=input('请重新输入英语成绩：')
d['python']=input('请重新输入python成绩：')
d['java']=input('请重新输入java成绩：')
except:
print('您的输入有误，请重新输入!!!')
else:
break
wfile.writelines(str(d)+'\n')
print('修改成功！！！')
else:
wfile.write(str(d)+'\n')
answer=input('是否继续修改y/n:')
if answer=='y':
modify()
def sort():
show()
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8') as rfile:
students_list=rfile.readlines()
students_new=[]
for item in students_list:
d=dict(eval(item))
students_new.append(d)
else:
return
asc_or_desc=input('请选择排序方式(0表示升序，1表示降序):')
if asc_or_desc=='0':
asc_or_desc_bool=False
elif asc_or_desc=='1':
asc_or_desc_bool=True
else:
print('您的输入有误，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Python成绩排序,3:按java成绩排序,0:按总成绩排序)')
if mode=='1':
students_new.sort(key=lambda x:int(x['english']),reverse=asc_or_desc_bool)
elif mode=='2':
students_new.sort(key=lambda x:int(x['python']),reverse=asc_or_desc_bool)
elif mode=='3':
students_new.sort(key=lambda x:int(x['java']),reverse=asc_or_desc_bool)
elif mode=='0':
students_new.sort(key=lambda x:int(x['english'])+int(x['python'])+int(x['java']),reverse=asc_or_desc_bool)
else:
print('您的输入有误，请重新输入')
sort()
show_student(students_new)
def total():
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8') as rfile:
students=rfile.readlines()
if students:
print(f'一共有{len(students)}名学生')
else:
print('还没有录入学生信息......')
else:
print('暂未保存数据信息......')
def show():
student_list=[]
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8') as rfile:
students=rfile.readlines()
for item in students:
student_list.append(eval(item))
if student_list:
show_student(student_list)
else:
print('尚未保存数据！！！')
if __name__=='__main__':
main()
