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def main():#主函数
while True:
menum()
choice=int(input('请选择：'))
if choice in [1,2,3,4,5,6,7]:
if choice==7:
answer=input('您确定要退出系统吗？y/n')
if 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()
else:
print('您输入的有误，请重新输入')
main()
