diff --git a/main.py b/main.py
new file mode 100644
index 0000000..a065fa0
--- /dev/null
+++ b/main.py
@@ -0,0 +1,388 @@
+import pymysql
+
+# 连接数据库
+db = pymysql.connect(host="localhost", port=3306, user="root", password="xieyuxin1810", database="studentinfo")
+cursor = db.cursor()
+
+
+# 录入学生信息：包括学号、姓名、英语成绩、python成绩、数学成绩、总成绩
+def input_info():
+    stu_id = input("请输入学生学号（如202001）：")
+    sql = "select * from stu_info where stu_id= %s  "
+    cursor.execute(sql, stu_id)
+    rs = cursor.fetchall()
+    if len(rs) > 0:
+        print("学号已存在,请重新输入")
+        go = input("是否进行继续输入,输入Y继续")
+        if go == "Y":
+            input_info()
+        else:
+            return
+    stu_name = input("请输入学生姓名：")
+    stu_score_eng = int(input("请输入学生英语成绩："))
+    stu_score_py = int(input("请输入学生python成绩："))
+    stu_score_math = int(input("请输入学生数学成绩："))
+    if len(rs) == 0:
+        sql = " insert into stu_info (stu_id,stu_name,stu_score_eng,stu_score_py,stu_score_math,stu_sum_score) values (%s,%s,%s,%s,%s,%s) "
+        cursor.execute(sql, (stu_id, stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_score_eng+stu_score_py+stu_score_math))
+    db.commit()
+    print("信息录入完毕！！")
+
+    go = input("是否进行继续输入,输入Y继续")
+    if go == "Y":
+        input_info()
+    else:
+        return
+
+# 查询学生信息：查询时分为按学号和按姓名查找两种
+def find_info():
+    find = int(input("按学号查找请输入1，按姓名查找请输入2："))
+    if find == 1:
+        stu_id = input("请输入学号:")
+        sql = "select * from stu_info where stu_id= %s  "
+        cursor.execute(sql, stu_id)
+        rs = cursor.fetchall()
+        if len(rs) == 0:
+            print("学号不存在,请重新输入")
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                find_info()
+            else:
+                return
+        else:
+            sql = " select stu_id,stu_name,stu_score_eng,stu_score_py,stu_score_math,stu_sum_score from stu_info where stu_id=%s"
+            cursor.execute(sql, stu_id)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0]))
+                print("姓名:%s" % (info[1]))
+                print("英语成绩:%s" % (info[2]))
+                print("python成绩:%s" % (info[3]))
+                print("数学成绩:%s" % (info[4]))
+                print("总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                find_info()
+            else:
+                return
+    elif find == 2:
+        stu_name = input("请输入姓名:")
+        sql = "select * from stu_info where stu_name= %s  "
+        cursor.execute(sql, stu_name)
+        rs = cursor.fetchall()
+        if len(rs) == 0:
+            print("姓名不存在,请重新输入")
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                find_info()
+            else:
+                return
+        else:
+            sql = " select stu_id,stu_name,stu_score_eng,stu_score_py,stu_score_math ,stu_sum_score from stu_info where stu_name=%s"
+            cursor.execute(sql, stu_name)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0]))
+                print("姓名:%s" % (info[1]))
+                print("英语成绩:%s" % (info[2]))
+                print("python成绩:%s" % (info[3]))
+                print("数学成绩:%s" % (info[4]))
+                print("总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                find_info()
+            else:
+                return
+
+    db.commit()
+
+
+# 删除学生信息：输入学号进行查找，查找到学生信息之后，对学生信息进行删除
+def del_info():
+    stu_id = input("请输入要删除的学生的学号：")
+    sql = "select * from stu_info where stu_id= %s  "
+    cursor.execute(sql, stu_id)
+    rs = cursor.fetchall()
+    if len(rs) > 0:
+        sql = "delete from stu_info where stu_id= %s  "
+        cursor.execute(sql, stu_id)
+        print("学号为%s的学生信息已被删除！！" % stu_id)
+        go = input("是否进行继续输入,输入Y继续")
+        if go == "Y":
+            del_info()
+        else:
+            return
+    else:
+        print("无此学生信息，请核对后再操作！！")
+        go = input("是否进行继续输入,输入Y继续")
+        if go == "Y":
+            del_info()
+        else:
+            return
+    db.commit()
+
+
+# 修改学生信息：输入学号后，查询到学生信息之后，对学生信息进行修改
+def mod_info():
+    stu_id = input("请输入要修改的学生学号：")
+    sql = "select * from stu_info where stu_id= %s  "
+    cursor.execute(sql, stu_id)
+    rs = cursor.fetchall()
+    if len(rs) > 0:
+        print("已找到学生，请修改信息！")
+        stu_name = input("请输入姓名：")
+        stu_score_eng = int(input("请输入英语成绩："))
+        stu_score_py = int(input("请输入python成绩："))
+        stu_score_math = int(input("请输入数学成绩："))
+        sql = "update stu_info set stu_name = %s, stu_score_eng = %s, stu_score_py = %s, stu_score_math = %s,stu_sum_score=%s where stu_id = %s  "
+        cursor.execute(sql, (stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_score_eng+stu_score_py+stu_score_math, stu_id))
+        db.commit()
+        print("学号为%s的学生信息已修改！！" % stu_id)
+        go = input("是否进行继续输入,输入Y继续")
+        if go == "Y":
+            mod_info()
+        else:
+            return
+    else:
+        print("无此学生信息，请核对后再操作！！")
+        go = input("是否进行继续输入,输入Y继续")
+        if go == "Y":
+            mod_info()
+        else:
+            return
+
+
+# 排序学生信息：排序的方式可选择升序和降序；可选择按英语、python、数学成绩以及总成绩进行排序
+def sort_info():
+    sub = int(input("1.按英语成绩排序\n"
+                    "2.按python成绩排序\n"
+                    "3.按数学成绩排序\n"
+                    "4.按学生总成绩排序\n"
+                    "请选择学科:"))
+    if sub == 1:
+        order = int(input("1.升序\n"
+                          "2.降序\n"
+                          "请输入排序方式:"))
+        if order == 1:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_sum_score from stu_info  order by stu_score_eng asc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+        elif order == 2:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_sum_score from stu_info  order by stu_score_eng desc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+    elif sub == 2:
+        order = int(input("1.升序\n"
+                          "2.降序\n"
+                          "请输入排序方式:"))
+        if order == 1:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_sum_score from stu_info  order by stu_score_py asc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+        elif order == 2:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_sum_score from stu_info  order by stu_score_py desc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+    elif sub == 3:
+        order = int(input("1.升序\n"
+                          "2.降序\n"
+                          "请输入排序方式:"))
+        if order == 1:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math ,stu_sum_score from stu_info  order by stu_score_math asc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+        elif order == 2:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_sum_score from stu_info  order by stu_score_math desc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+    elif sub == 4:
+        order = int(input("1.升序\n"
+                          "2.降序\n"
+                          "请输入排序方式:"))
+        if order == 1:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math," \
+                  "stu_sum_score " \
+                  "from stu_info  order by sumSore asc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+
+        elif order == 2:
+            sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math," \
+                  "stu_sum_score " \
+                  "from stu_info  order by sumSore asc "
+            cursor.execute(sql)
+            rs = cursor.fetchall()
+            for info in rs:
+                print("学号:%s" % (info[0])
+                      + "-" + "姓名:%s" % (info[1])
+                      + "-" + "英语成绩:%s" % (info[2])
+                      + "-" + "python成绩:%s" % (info[3])
+                      + "-" + "数学成绩:%s" % (info[4])
+                      + "-" + "总成绩:%s" % (info[5]))
+            go = input("是否进行继续输入,输入Y继续")
+            if go == "Y":
+                sort_info()
+            else:
+                return
+    else:
+        print("请输入以上选项")
+    go = input("是否进行继续输入,输入Y继续")
+    if go == "Y":
+        sort_info()
+    else:
+        return
+
+# 统计学生总数
+# 输出信息管理系统中有几个学生的信息
+def sum_info():
+    sql = "select * from stu_info"
+    cursor.execute(sql)
+    rs = cursor.fetchall()
+    print("一共有%s名学生。" % len(rs))
+
+
+
+# 显示学生信息
+def show_info():
+    sql = "select stu_id,stu_name, stu_score_eng, stu_score_py, stu_score_math,stu_sum_score from stu_info"
+    cursor.execute(sql)
+    rs = cursor.fetchall()
+    for info in rs:
+        print("学号:%s" % (info[0])
+              + "-" + "姓名:%s" % (info[1])
+              + "-" + "英语成绩:%s" % (info[2])
+              + "-" + "python成绩:%s" % (info[3])
+              + "-" + "数学成绩:%s" % (info[4])
+              + "-" + "总成绩:%s" % (info[5]))
+
+def show_choose():
+    print("==========================学生信息管理系统==========================")
+    print()
+    print("-----------------------------功能菜单-----------------------------")
+    print()
+    print("                         1.录入学生信息")
+    print("                         2.查找学生信息")
+    print("                         3.删除学生信息")
+    print("                         4.修改学生信息")
+    print("                         5.排序学生信息")
+    print("                         6.统计学生总数")
+    print("                         7.显示学生信息")
+    print("                         0.退出信息管理系统")
+    print()
+    print("----------------------------------------------------------------")
+
+
+def main():
+    while True:
+        show_choose()
+        choose_menu = input("请选择功能菜单：")
+        if choose_menu == '0':
+            break
+        elif choose_menu == '1':
+            input_info()
+        elif choose_menu == '2':
+            find_info()
+        elif choose_menu == '3':
+            del_info()
+        elif choose_menu == '4':
+            mod_info()
+        elif choose_menu == '5':
+            sort_info()
+        elif choose_menu == '6':
+            sum_info()
+        elif choose_menu == '7':
+            show_info()
+        else:
+            break
+    print("欢迎您再次使用！！")
+    db.close()
+
+
+if __name__ == '__main__':
+    main()
+
+