# 添加、刪除、顯示學(xué)生信息（保存）

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# 保存所有學(xué)生信息

students = {}

# 創(chuàng)建

ID = 1000

# 控制系統(tǒng)是否退出

flag = True

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# 從文件中讀取學(xué)生信息

def load_students():

??? # 加載學(xué)生信息從文件中

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

??? # 讀取文件內(nèi)容

??? stus = stu_file.readlines()

??? global students

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??? # 解析文件數(shù)據(jù)

??? 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(xué)生信息轉(zhuǎn)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(xué)生數(shù)據(jù)寫會(huì)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(xué)生信息到文件

??? # 1.將每一個(gè)學(xué)生的信息，拼接成一個(gè)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(guān)閉文件

??? stu_file.close()

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def add_student():

??? # 添加新學(xué)生

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??? global students

??? global ID

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??? stu_name = input("請(qǐng)輸入新學(xué)生的姓名:")

??? stu_score = input("請(qǐng)輸入新學(xué)生的分?jǐn)?shù):")

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??? # 構(gòu)建學(xué)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(xué)生添加學(xué)生字典中

??? students[ID] = stu_info

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def show_students():

??? # 顯示所有學(xué)生信息

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

??????? print("學(xué)號(hào):%d\t姓名:%s\t分?jǐn)?shù):%s"%(k, v["name"], v["score"]))

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

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defremove_student():

??? # 刪除學(xué)生信息根據(jù)學(xué)生編號(hào)

??? delete_id =int(input("請(qǐng)輸入要?jiǎng)h除學(xué)生的學(xué)號(hào):"))

??? # 判斷要?jiǎng)h除學(xué)生的編號(hào)是否存在

??? global students

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

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

??????? print("刪除編號(hào)為%d的學(xué)生成功!" % delete_id)

??? else:

??????? print("您輸入的編號(hào)有誤!")

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defshow_operation():

??? print("請(qǐng)選擇操作:")

??? print("1.添加學(xué)生")

??? print("2.刪除學(xué)生")

??? print("3.顯示學(xué)生")

??? print("4.退出系統(tǒng)")

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

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# 加載數(shù)據(jù)

load_students()

while flag:

??? print("歡迎使用學(xué)生管理系統(tǒng)v1.0")

??? # 顯示菜單

??? show_operation()

??? operation = input("請(qǐng)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(tǒng)!")

??????? flag = False

??????? save_students()

??? else:

??????? print("操作有誤，請(qǐng)重新輸入!")

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