import os
filename='student.txt'
def main():
while True:
menu()
choice=int(input('请选择你要做的事情'))
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,再见')
break #退出系统
else:
continue
elif choice==1:
insert() #录入学生信息
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 menu():
print('======================学生信息管理系统======================')
print('-------------------------功能菜单--------------------------')
print('\t\t\t\t\t\t1.录入学生信息')
print('\t\t\t\t\t\t2.查找学生信息')
print('\t\t\t\t\t\t3.删除学生信息')
print('\t\t\t\t\t\t4.修改学生信息')
print('\t\t\t\t\t\t5.排序')
print('\t\t\t\t\t\t6.统计学生总人数')
print('\t\t\t\t\t\t7.显示所有学生信息')
print('\t\t\t\t\t\t0.退出')
print('——————————————————————————————————————————————————————————')
def insert():
student_list=[]
while True:
id=input('请输入ID(如1001):')
if not id:
break
name=input('请输入姓名:')
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
#将录入的学生信息保存到字典中
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':
continue
else:
break
#调用save()函数
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,'w',encoding='utf-8')
for item in lst:
stu_txt.write(str(item)+'\n')
stu_txt.close()
def search():
pass
def delete():
while True:
student_id=input('请输入要删除的学生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 #标记是否删除
if student_old:
with open(filename,'w',encoding='utf-8')as wfile:
d={}
for item in student_old:
d=dict(eval(item)) #将字符串转成字典
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() #删除之后要重新显示所有学生信息
answer=input('是否继续删除y/n\n')
if answer=='y':
continue
else:
break
def modify():
pass
def sort():
pass
def total():
pass
def show():
pass
if __name__ == '__main__':
main()
下面是报错
Traceback (most recent call last):
File "C:\Users\kyrie\PycharmProjects\pythonProject\venv\stusystem.py", line 127, in
main()
File "C:\Users\kyrie\PycharmProjects\pythonProject\venv\stusystem.py", line 20, in main
delete()
File "C:\Users\kyrie\PycharmProjects\pythonProject\venv\stusystem.py", line 98, in delete
if d['id']!=int(student_id):
KeyError: 'id'