python学生管理系统的实现

```name_list = [] # 存储学生信息字典，学生信息用字典存，再用列表存储字典
# 菜单
def display_menu():
print("-"*30)
print(" 学生管理系统 v8.8 ")
print("1.添加学生信息")
print("2.删除学生信息")
print("3.修改学生信息")
print("4.查询单个学生信息")
print("5.查询所有学生信息")
print("6.退出系统")  
print("-"*30)
# 选择序号的获得
def get_choice():
selected_key = input("请输入选择的序号：")
return selected_key
# 检查性别是否合法
def check_sex(new_sex):
flag = True
while flag:
if new_sex == '男' or new_sex == '女':
flag = False
else:
new_sex = input("输入性别有误，请重新输入(男/女)：")
return new_sex
# 检查电话号码是否合法
def check_phone(new_phone):
flag = True
while flag:
if new_phone.isdigit():
flag = False
else:
new_phone = input("您输入的电话号码有误，请重新输入：")
return new_phone
# 检查学号是否重复或者有误
def check_id(new_id):
flag = True
while flag:
# 先检查是不是纯数字再去考虑是否重复的事情，如果不是纯数字直接pass
if new_id.isdigit():
for i in range(len(name_list)):
if name_list[i]['id'] == new_id:
new_id = check_id(input("您输入的学号重复，请重新输入："))
flag = False
else:
new_id = input("您输入的学号有误，请重新输入：")
return new_id
# 添加学生信息
def add_name():
new_info = {}
new_id = check_id(input("请输入学号："))
new_info['id'] = new_id
new_name = input("请输入姓名：")
new_info['name'] = new_name
new_sex = check_sex(input("请输入性别(男/女)："))
new_info['sex'] = new_sex
new_phone = check_phone(input("请输入电话号码："))
new_info['phone'] = new_phone
name_list.append(new_info)
print("添加成功！")
# 查询所有学生信息
def find_all():
print("="*30)
for name in name_list:
print(name['id'], name['name'], name['sex'], name['phone'])
print("=" * 30)
# 删除学生信息
def del_name():
del_id_is = input("请输入要删除的学生学号：")
flag = False
index = 0
for i in range(len(name_list)):
if name_list[i]['id'] == del_id_is:
flag = True
index = i
break
if flag:
name_list.pop(index)
print("删除成功！")
else:
print("学生未找到！请检查学号输入是否有误！")
# 名字修改细节函数
def choice_of_name(index):
while True:
choice = input("请输入要修改学生的(1.id 2.姓名 3.性别 4.电话号码，5.全部修改)：")
if choice == '5':
new_id = input("请输入新的学号：")
name_list[index]['id'] = new_id
new_name = input("请输入新的姓名：")
name_list[index]['name'] = new_name
new_sex = check_sex(input("请输入性别(男/女)："))
name_list[index]['sex'] = new_sex
new_phone = check_phone(input("请输入电话号码："))
name_list[index]['phone'] = new_phone
break
elif choice == '1':
new_id = input("请输入新的学号：")
name_list[index]['id'] = new_id
break
elif choice == '2':
new_name = input("请输入新的姓名：")
name_list[index]['name'] = new_name
break
elif choice == '3':
new_sex = check_sex(input("请输入性别(男/女)："))
name_list[index]['sex'] = new_sex
break
elif choice == '4':
new_phone = check_phone(input("请输入电话号码："))
name_list[index]['phone'] = new_phone
break
else:
print("输入有误，请重新输入！")
# 修改学生信息
def re_name():
id_is = input("请输入要修改的学生学号：")
flag = False
index = 0
# 先找到要修改的学生的下标
for i in range(len(name_list)):
if name_list[i]['id'] == id_is:
flag = True
index = i
break
if flag:
choice_of_name(index)
print("修改成功！")
else:
print("修改失败，学生信息未找到！")
# 查询单个学生信息
def find_name():
find_id_is = input("请输入要查询的学生学号：")
flag = False
index = 0
for i in range(len(name_list)):
if name_list[i]['id'] == find_id_is:
flag = True
index = i
break
if flag:
print("学生查询到，学生信息为：")
print(name_list[index]['id'], name_list[index]['name'], name_list[index]['sex'], name_list[index]['phone'])
else:
print("学生未找到！")
def main():
exit_name = True
while exit_name:
display_menu()
key = get_choice()
if key == '1':
add_name()
elif key == '2':
del_name()
elif key == '3':
re_name()
elif key == '4':
find_name()
elif key == '5':
find_all()
elif key == '6':
exit_name = False
else:
print("请输入正确的数值！")
main()