diff --git a/main.py b/main.py
new file mode 100644
index 0000000..662f13d
--- /dev/null
+++ b/main.py
@@ -0,0 +1,279 @@
+import os.path
+
+filename = 'students.txt'
+
+
+def main():
+    while True:
+        menu()
+        choice = int(input('请选择功能（0~7）'))
+        if choice in [0, 1, 2, 3, 4, 5, 6, 7]:
+            if choice == 0:
+                answer = input('您确定退出系统吗？y/n')
+                if answer == 'y' or answer == 'Y':
+                    print("欢迎再次使用！")
+                    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()
+            elif choice == 7:
+                show()
+        input()
+
+
+def menu():
+    print('=======================================')
+    print('==========湖南大学学生信息管理系统==========')
+    print('=======================================')
+    print('\t\t\t1.录入信息')
+    print('\t\t\t2.查找信息')
+    print('\t\t\t3.删除信息')
+    print('\t\t\t4.修改信息')
+    print('\t\t\t5.对成绩进行排序')
+    print('\t\t\t6.统计人数')
+    print('\t\t\t7.显示所有信息')
+    print('\t\t\t0.退出')
+    print('======================================')
+
+
+def insert():
+    student_list = []
+    while True:
+        id = input("请输入学号：")
+        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，请重新输入")
+        # 将录入的学生信息保存在字典中
+        student = {'id': id, 'name': name, 'english': english, 'python': python, 'java': java}
+        # 将学生信息添加到列表中
+        student_list.append(student)
+        answer = input("是否继续添加y/n?")
+        if answer == 'y':
+            continue
+        else:
+            break
+    # 调用save函数保存信息
+    save(student_list)
+    print("信息保存成功")
+
+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():
+    student_query = []
+    while True:
+        id = ''
+        name = ''
+        if os.path.exists(filename):
+            mode = input("按学号查找请按1，按姓名查找请按2：")
+            if mode == '1':
+                id = input("请输入学生学号：")
+            elif mode == '2':
+                name = input("请输入学生新明：")
+            else:
+                print("输入有误，请重新输入")
+                search()
+            with open(filename, 'r', encoding='utf-8') as file:
+                student = file.readlines()
+                for item in student:
+                    d = dict(eval(item))
+                    if id != '':
+                        if d['id'] == id:
+                            student_query.append(d)
+                    elif name != '':
+                        if d['name'] == name:
+                            student_query.append(d)
+            show_query(student_query)
+            # 清空列表
+            student_query.clear()
+            answer = input("是否继续查询？y/n")
+            if answer == 'y':
+                continue
+            else:
+                break
+        else:
+            print("无学生信息")
+            return
+
+
+def show_query(lst):
+    if len(lst) == 0:
+        print("无相关信息")
+        return
+    # 定义标题显示格式
+    format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
+    print(format_title.format('ID', '姓名', '英语成绩', 'python成绩', 'Java成绩', '总成绩'))
+    # 定义内容显示格式
+    format_data = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
+    for item in lst:
+        print(format_data.format(item.get('id'),
+                                 item.get('name'),
+                                 item.get('english'),
+                                 item.get('english'),
+                                 item.get('java'),
+                                 int( item.get('english')) + int( item.get('english')) + int( item.get('java'))
+                                 ))
+
+
+def delete():
+    while True:
+        student_id = input("请输入删除学生的学号：")
+        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
+            if student_old:  # 空列表等于 False，非空列表等于True
+                with open(filename,'w',encoding='utf-8') as wfile:
+                    # 只用于写入。如果该文件已存在则打开文件，并从开头开始编辑，即原有内容会被删除
+                    d = {}
+                    for item in student_old:
+                        d = dict(eval(item))  # 将字符串转换为字典
+                        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'没有找到学生学号为{student_id}的学生')
+            else:
+                print("无学生信息")
+                break
+            show()
+            answer = input("是否继续删除？y/n")
+            if answer == 'y':
+                continue
+            else:
+                break
+
+
+def modify():
+    show()
+    if os.path.exists(filename):
+        with open(filename, 'r', encoding='utf-8') as file:
+            student_old = file.readlines()
+    else:
+        return
+    student_id = input("请输入修改学生的学号：")
+    with open(filename, 'w', encoding='utf-8') as wfile:
+        for item in student_old:
+            d = {}
+            d = dict(eval(item))
+            if d['id'] == student_id:
+                print("已经找到学生信息，请修改相关信息")
+                while True:
+                    try:
+                        d['name'] = input("请输入姓名")
+                        d['english'] = input("请输入英语成绩")
+                        d['python'] = input("请输入python成绩")
+                        d['java'] = input("请输入Java成绩")
+                    except:
+                        print("输入有误，请重新输入")
+                    else:
+                        break
+                    wfile.write(str(d) + '\n')
+                    print("修改成功")
+            else:
+                wfile.write(str(d)+'\n')
+            answer = input("是否继续修改其他学生信息？y/n")
+            if answer == 'y':
+                modify()
+            else:
+                return
+
+
+def sort():
+    show()
+    if os.path.exists(filename):
+        with open(filename, 'r', encoding= 'utf-8') as file:
+            students = file.readlines()
+        students_new = []
+        for item in students:
+            d = dict(eval(item))
+            students_new.append(d)
+    else:
+        return
+
+    # 排序方式
+    asc_or_desc = input("请选择升序 0 还是降序 1？")
+    if asc_or_desc == '0':
+        asc_or_desc_bool = False
+    elif asc_or_desc == '1':
+        asc_or_desc_bool = True
+    else:
+        print("输入有误，请重新输入")
+        sort()
+    mode = input("请选择排序方式(1.英语 2.python 3.Java 4.总成绩)：")
+    if mode == '1':
+        students_new.sort(key=lambda x : int(x['english']), reverse=asc_or_desc_bool)
+        # x 代表列表students_new中的项
+    elif mode == '2':
+        students_new.sort(key=lambda x: int(x['python']), reverse=asc_or_desc_bool)
+    elif mode == '3':
+        students_new.sort(key=lambda x: int(x['java']), reverse=asc_or_desc_bool)
+    elif mode == '4':
+        students_new.sort(key=lambda x: int(x['english']) + int(x['python']) + int(x['java']), reverse=asc_or_desc_bool)
+    else:
+        print("输入有误，请重新输入")
+    show_query(students_new)
+
+
+def total():
+    if os.path.exists(filename):
+        with open(filename, 'r', encoding='utf-8') as file:
+            students = file.readlines()
+            if students:
+                print(f"总共有{len(students)}名学生")
+            else:
+                print("无学生信息")
+    else:
+        print("无学生信息")
+
+
+def show():
+    student_query = []
+    if os.path.exists(filename):
+        with open(filename, 'r', encoding='utf-8') as file:
+            student = file.readlines()
+            for item in student:
+                d = dict(eval(item))
+                student_query.append(d)
+        show_query(student_query)
+        # 清空列表
+        student_query.clear()
+    else:
+        print("无学生信息")
+        return
+
+
+if __name__ == '__main__':
+    main()
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