def menu():
print('= ' * 30)
print('\twelcome to the student management system')
print('1.添加学生信息')
print('2.查看学生信息')
print('3.删除学生信息')
print('4.修改学生信息')
print('5.退出系统')
print('=' * 30)
student = []
while True:
menu()
number = int(input('输入选项：'))
# 添加学生信息
if number == 1:
name = input('输入学生姓名：')
sex = input('输入学生性别：')
id = int(input('输入学生学号：'))
person = {'姓名':name,'性别':sex,'学号':id}
student.append(person)
print('学生信息添加成功')
# print(py_class)
# number = int(input('输入选项：'))
# 2.显示学生信息
elif number == 2:
if len(student) == 0:
print('请先添加学生信息！！')
else:
print(student[:])
# for x in student:
# print('姓名：%s 年龄：%s 学号：%d' % (x['name'],x['sex'],x['id']))
# 删除学生信息
elif number == 3:
del_name = input('输入删除的学生姓名：')
Y = y = True
N = n = False
for item in student[:]:
# print(item)
if item['姓名'] ==del_name:
student.remove(item)
print('删除成功！！')
# print('学生信息为:%s' % item)
# choise = input('是否删除该学生信息(Y/N)：')
# if choise == Y:
#
# student.remove(item)
# print('删除成功')
# else:
# break
# 修改学生信息
elif number == 4:
change_name = input('输入想要修改学生姓名：')
for item in student[:]:
if item['姓名'] == change_name:
change_name = input('输入修改后学生姓名：')
change_sex = input('输入修改后学生性别：')
change_id = int(input('输入修改后学生学号：'))
new_student = {'姓名': change_name, '性别': change_sex, '学号': change_id}
item.update(new_student)
print('修改成功！！')
elif number == 5:
print('已退出系统')
break
运行结果:
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：1
输入学生姓名：王
输入学生性别：男
输入学生学号：1
学生信息添加成功
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：1
输入学生姓名：糖
输入学生性别：女
输入学生学号：2
学生信息添加成功
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：2
[{'姓名': '王', '性别': '男', '学号': 1}, {'姓名': '糖', '性别': '女', '学号': 2}]
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：3
输入删除的学生姓名：王
删除成功！！
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：2
[{'姓名': '糖', '性别': '女', '学号': 2}]
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：4
输入想要修改学生姓名：糖
输入修改后学生姓名：唐
输入修改后学生性别：女
输入修改后学生学号：2
修改成功！！
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：2
[{'姓名': '唐', '性别': '女', '学号': 2}]
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
welcome to the student management system
1.添加学生信息
2.查看学生信息
3.删除学生信息
4.修改学生信息
5.退出系统
==============================
输入选项：5
已退出系统
