# 添加、刪除、顯示學生信息（保存）

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# 保存所有學生信息

students = {}

# 創建

ID = 1000

# 控制系統是否退出

flag = True

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# 從文件中讀取學生信息

def load_students():

??? # 加載學生信息從文件中

??? stu_file = open("students.txt","r")

??? # 讀取文件內容

??? stus = stu_file.readlines()

??? global students

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??? # 解析文件數據

??? max_id = 0

??? for stu in stus:

??????? #去掉字符串最尾部的換行符\n

??????? stu_list =stu[0:-1].split(",")

??????? #學生信息轉成字典類型

??????? s_info = {}

??????? s_info["name"] = stu_list[1]

??????? s_info["score"] = stu_list[2]

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??????? #將學生數據寫會students字典中

??????? id = int(stu_list[0])

??????? students[id] = s_info

??????? if id > max_id:

??????????? max_id = id

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??????? ID = max_id

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def save_students():

??? # 保存學生信息到文件

??? # 1.將每一個學生的信息，拼接成一個字符串

??? stu_info = []

??? stu_file = open("students.txt","w")

??? for k, v in students.items():

??????? stu_info.append(str(k))

??????? stu_info.append(v["name"])

??????? stu_info.append(v["score"])

??????? stu_data = ",".join(stu_info)

??????? stu_data = stu_data + "\n"

??????? stu_file.write(stu_data)

??????? stu_info.clear()

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??? # 關閉文件

??? stu_file.close()

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def add_student():

??? # 添加新學生

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??? global students

??? global ID

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??? stu_name = input("請輸入新學生的姓名:")

??? stu_score = input("請輸入新學生的分數:")

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??? # 構建學生的字典

??? stu_info = {}

??? stu_info["name"] = stu_name

??? stu_info["score"] = stu_score

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??? #遞增ID

??? ID += 1

??? #　將新學生添加學生字典中

??? students[ID] = stu_info

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def show_students():

??? # 顯示所有學生信息

??? for k, v in students.items():

??????? print("學號:%d\t姓名:%s\t分數:%s"%(k, v["name"], v["score"]))

??? print("----------------")

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defremove_student():

??? # 刪除學生信息根據學生編號

??? delete_id =int(input("請輸入要刪除學生的學號:"))

??? # 判斷要刪除學生的編號是否存在

??? global students

??? if delete_id in students.keys():

??????? del students[delete_id]

??????? print("刪除編號為%d的學生成功!" % delete_id)

??? else:

??????? print("您輸入的編號有誤!")

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defshow_operation():

??? print("請選擇操作:")

??? print("1.添加學生")

??? print("2.刪除學生")

??? print("3.顯示學生")

??? print("4.退出系統")

??? print("------------")

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# 加載數據

load_students()

while flag:

??? print("歡迎使用學生管理系統v1.0")

??? # 顯示菜單

??? show_operation()

??? operation = input("請輸入您的操作:")

??? if operation == "1":

??????? add_student()

??? elif operation == "2":

??????? remove_student()

??? elif operation == "3":

??????? show_students()

??? elif operation == "4":

??????? print("歡迎再次使用本系統!")

??????? flag = False

??????? save_students()

??? else:

??????? print("操作有誤，請重新輸入!")

總結

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