非文件版的学生管理系统

import os
import json
file_name = "student.txt"
all_dict = {}

# 加载文件中的数据
def load_file():
    # 如果没有文件，则创建文件
    if not os.path.exists(file_name):
        with open(file_name, "w", encoding="utf8") as f:
            f.write("{}")

    # 如果文件已经存在则读取文件
    with open(file_name, "r", encoding="utf8") as f:
        print(json.load(f))

# 添加
def add():
    dic = {}
    name = input("请您输入姓名： ").strip()
    age = input("请您输入年龄： ").strip()
    sex = input("请您输入性别： ").strip()
    dic["name"] = name
    dic["age"] = age
    dic["sex"] = sex
    if name in all_dict:
        print("此学生已在系统内")
        pass
    else:
        all_dict[name] = dic
# 删除
def dele():
    name = input("请输入要删除的姓名： ").strip()
    if name in all_dict:
        del all_dict[name]
    else:
        print("系统中无此学生，删除毛线啊！")

# 修改
def update():
    name = input("请输入要更新的学生姓名： ").strip()
    if name in all_dict:
        age = input("请输入年龄： ").strip()
        sex = input("请输入性别： ").strip()
        all_dict[name]["age"] = age
        all_dict[name]["sex"] = sex
    else:
        print("系统中无此学生，更新个屁！")

# 查询
def select():
    name = input("请输入要查询的学生姓名： ").strip()
    if name in all_dict:
        print(all_dict[name])
    else:
        print("无此学生，请添加！")

# 查询所有
def print_all():
    if len(all_dict) > 0:
        for k in all_dict:
            print(all_dict[k])
    else:
        print("空的！")
def q():
    exit()

# 函数字典
choice_dict = {
    1: add,
    2: dele,
    3: update,
    4: select,
    5: print_all,
    6: q
}


while True:
    print("\033[31;1m欢迎登录博客园\n1:添加\n2:删除\n3:更新\n4:查询\n5:查看所有\n6:退出\033[0m")
    choice = input("请输入要选择的编: ").strip()
    if choice.isdigit():
        choice = int(choice)
        if choice > 0 and choice <= len(choice_dict):
            choice_dict[choice]()
        else:
            print("您输入的编号超出范围, 看好后重新输入！")
    else:
        print("输入非法, 请重新输入！")