這是個簡單的學籍管理系統，將學生資訊放在大字典當中，以學生學號為鍵，以包括學生其他資訊的一個小字典為值，做到了對簡單資訊的增刪改查。
以下為原始碼（因為語言表述不準確，所以未在程式內進行註釋，怕註釋不能盡其義）：

def ReadFromFile(path):
    with open(path,"r") as filer:
        content = filer.read()
        return eval(content)
def WriteToFile(path,Additional):
    with open(path,"w") as filew:
        filew.write(Additional)
        return True
userdic = ReadFromFile("D:\\StudentManagerSystem.txt")
print("-" * 30)
print("學生學籍管理系統 V2.0")
print("輸入以下序號可執行對應功能：")
print("1:新增學生學籍資訊。")
print("2:刪除學生學籍資訊。")
print("3:修改學生學籍資訊。")
print("4:查詢學生學籍資訊。")
print("5:查詢所有學生學籍資訊。")
print("6:安全退出系統。")
print("-" * 30)
while True:
    function = int(input("請輸入您需要進行的功能編號："))
    if function == 1:
        print("您選擇了新增學生學籍資訊。")
        StudentId = input("請輸入學生學號：")
        for BianHao in userdic.keys():
            if StudentId == BianHao:
                print("您輸入的學生資訊已存在。")
                break
            else:
                continue
        else:
            StudentName = input("請輸入學生姓名：")
            StudentAge = input("請輸入學生年齡：")
            StudentAddress = input("請輸入學生戶口所在地：")
            NeiDic = {"姓名":StudentName,"年齡":StudentAge,"住址":StudentAddress}
            userdic[StudentId] = NeiDic
            userdic_w = str(userdic)
            WriteToFile("D:\\StudentManagerSystem.txt",userdic_w)
            print("新增資訊成功。")
    elif function == 2:
        print("您選擇了刪除學生學籍資訊。")
        StudentId = input("請輸入學生學號：")
        for BianHao in userdic.keys():
            if StudentId == BianHao:
                del userdic[StudentId]
                print("刪除學生學籍資訊成功。")
                break
        else:
            print("您輸入的學生學號不存在。")
    elif function == 3:
        print("您選擇了修改學生學籍資訊。")
        StudentId = input("請輸入您要修改的學生編號：")
        ModifyNumber = int(input("請輸入您要修改的內容(1:修改學號；2:修改姓名；3:修改年齡；4:修改住址；0:退出修改):"))
        if ModifyNumber == 1:
            StudentId_new = input("請輸入修改後的學生編號：")
            for BianHao_new in userdic.keys():
                if BianHao_new == StudentId_new:
                    print("您輸入的學生編號已存在。")
                    break
            else:
                for BianHao in userdic.keys():
                    if StudentId == str(BianHao):
                        userdic[StudentId_new] = userdic.pop(StudentId)
                        userdic_w = str(userdic)
                        WriteToFile("D:\\StudentManagerSystem.txt", userdic_w)
                else:
                    print("您要修改的學生編號不存在。")
        elif ModifyNumber == 2:
            StudentName = input("請輸入學生姓名：")
            userdic[StudentId]["姓名"] = StudentName
            userdic_w = str(userdic)
            WriteToFile("D:\\StudentManagerSystem.txt", userdic_w)
            print("修改學生姓名資訊成功。")
        elif ModifyNumber == 3:
            StudentAge = input("請輸入學生年齡：")
            userdic[StudentId]["年齡"] = StudentAge
            userdic_w = str(userdic)
            WriteToFile("D:\\StudentManagerSystem.txt", userdic_w)
            print("修改學生年齡資訊成功。")
        elif ModifyNumber == 4:
            StudentAddress = input("請輸入學生住址：")
            userdic[StudentId]["住址"] = StudentAddress
            userdic_w = str(userdic)
            WriteToFile("D:\\StudentManagerSystem.txt", userdic_w)
            print("修改學生住址資訊成功。")
        elif ModifyNumber == 0:
            pass
    elif function == 4:
        print("您選擇了查詢學生學籍資訊：")
        StudentId = input("請輸入學生學號：")
        for BianHao in userdic.keys():
            if StudentId == BianHao:
                print("姓名：",userdic[StudentId]["姓名"],"；年齡：",userdic[StudentId]["年齡"],"；住址：",userdic[StudentId]["住址"])
                break
        else:
            print("您查詢的學生資訊不存在。")
    elif function == 5:
        print("您選擇了查詢全體學生的學籍資訊：")
        print("  學號","\t"*3,"姓名","\t"*3,"年齡","\t"*2,"住址")
        for k,v in userdic.items():
            print(" ",k,end="")
            for w in v.values():
                print("\t"*3,w,end="")
            print("")
    elif function == 6:
        Quit = int(input("確認退出本系統？輸入1(是)或者2(否)"))
        if Quit == 1:
            print("謝謝您的使用，lyy將竭誠為您服務。")
            break
        elif Quit == 2:
            pass
 

這是剛學習時候自己寫的，基本沒有查閱資料，改BUG改了一下午，確實有點辛苦，但是感覺敲程式碼的時候會是有點滿足感的成分在裡面，加油。
以下附程式執行結果的兩張圖：