這段代碼是一個(gè)更大的程序的一部分，該程序使用 google Sheets API 從云數(shù)據(jù)庫中獲取數(shù)據(jù)（不是真正相關(guān)，但一點(diǎn)上下文永遠(yuǎn)不會(huì)受到傷害！）我在一個(gè)名為“oop.py”的 python 文件中有這段黑色代碼class SetupClassroom:    def __init__(self, arraynumber='undefined', tkroot='undefined'):        self.arraynumber = arraynumber        self.tkroot = tkroot    def setarraynumber(self, number):        from GUI_Stage_3 import showclassroom        self.arraynumber = number        print ('set array number:', number)        showclassroom()    def settkroot(self, tkrootinput):        self.tkroot = tkrootinputself.tkroot 已被另一部分代碼賦值。這一點(diǎn)有效，因?yàn)槲乙呀?jīng)測試過它正在被分配，但是，當(dāng)我在另一個(gè)這樣的文件中調(diào)用“self.tkroot”時(shí)def showclassroom():    from oop import SetupClassroom    username = current_user.username    classnumber = getnumberofuserclassrooms(username)    if SetupClassroom.arraynumber > classnumber:        errorwindow('you are not enrolled in that many classrooms!')    else:        classtoget = SetupClassroom.arraynumber        print('classtoget:', classtoget)        root = SetupClassroom.tkroot        name_label = Label(root, text=classtoget)        getclassroom(username, classtoget)SetupClassroom = SetupClassroom我收到這個(gè)錯(cuò)誤Exception in Tkinter callbackTraceback (most recent call last):  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/tkinter/__init__.py", line 1705, in __call__    return self.func(*args)  File "/Users/jonathansalmon/PycharmProjects/Coursework_GUI/GUI_Stage2_better.py", line 176, in <lambda>    l0 = ttk.Button(teacher_root, text=button0text, command=lambda: (SetupClassroom.setarraynumber(SetupClassroom, number=button0text), SetupClassroom.settkroot(SetupClassroom, 'teacher_root')))  File "/Users/jonathansalmon/PycharmProjects/Coursework_GUI/oop.py", line 99, in setarraynumber    showclassroom()  File "/Users/jonathansalmon/PycharmProjects/Coursework_GUI/GUI_Stage_3.py", line 29, in showclassroom    root = SetupClassroom.tkrootAttributeError: type object 'SetupClassroom' has no attribute 'tkroot'我嘗試在 python 控制臺(tái)中設(shè)置它并且它起作用了，所以我不知道問題是什么。如果有人可以提供幫助，將不勝感激 謝謝！約翰