条目（自己，textvar = firstName）给出NameError：名称“ firstName”未定义

Question

所以基本上，我正在创建具有不同窗口/框架的程序。在每个这些框架上，我都希望有一个不同的小型程序，例如，一个窗口允许登录页面，然后另一个窗口允许注册。目前，我可以使用按钮在每个框架之间切换，并在每个框架上都有标签。我有一个单独的程序，它可以注册一个帐户和有关他们的信息，然后还有另一个单独的程序，它可以登录一个帐户，以检查所创建的数据库中该信息是否正确。

我现在的主要问题是，基本上将其与不同的框架合并在一起，从而在我的整个程序中实现不同的功能。我目前的主要问题是，每当我在输入框中添加程序时，程序就会继续为我不了解的 init 错误提示。（很抱歉，我的编程知识不是很高级为此，这就是为什么我要寻求帮助）

[

    from tkinter import *
    from tkinter import ttk
    from tkinter import messagebox
    import sqlite3



    class App(Tk):
            def __init__(self, *args, **kwargs):
                    Tk.__init__(self, *args, **kwargs)
                    Tk.iconbitmap(self, default="fishicon3.ico")
                    Tk.wm_title(self, "Crumlin Fishing Club")


                    #Setup Menu
                    MainMenu(self)
                    #Setup Frame
                    container = Frame(self)
                    container.pack(side="top", fill="both", expand = True)
                    container.grid_rowconfigure(0, weight=1)
                    container.grid_columnconfigure(0, weight=1)

                    self.frames = {}

                    for F in (StartPage, PageOne, PageTwo):
                            frame = F(container, self)
                            self.frames[F] = frame
                            frame.grid(row=0, column=0, sticky="nsew")

                    self.show_frame(StartPage)  
            def show_frame(self, context):
                    frame = self.frames[context]
                    frame.tkraise()

    class StartPage(Frame):
            def __init__(self, parent, controller):
                    Frame.__init__(self, parent)

                    label = Label(self, text="Start Page")
                    label.place(x=30,y=5)
                    start_page = ttk.Button(self, text="Start Page", command=lambda:controller.show_frame(StartPage))
                    start_page.place(x=25,y=25)
                    page_one = ttk.Button(self, text="Page One", command=lambda:controller.show_frame(PageOne))
                    page_one.place(x=25,y=50)
                    page_two = ttk.Button(self, text="Page Two", command=lambda:controller.show_frame(PageTwo))
                    page_two.place(x=25,y=75)
                    lblWelcome = Label(self, text="WELCOME! Welcome to the website of the Crumlin and District Angling Association owners of the fishing rights to the Crumlin River, Co. Antrim.",width=115,font=("bold", 10))
                    lblWelcome.place(x=500,y=50)





    class PageOne(Frame):
            def __init__(self, parent, controller):
                    Frame.__init__(self, parent)

                    label = Label(self, text="Page One")
                    label.place(x=30,y=5)
                    firstNameLabel = Label(self, text="First Name",width=20,font=("bold", 10))
                    firstNameLabel.place(x=350,y=100)
                    secondNameLabel = Label(self, text="Second Name",width=20,font=("bold", 10))
                    secondNameLabel.place(x=350,y=125)
                    usernameLabel = Label(self, text="Username",width=20,font=("bold", 10))
                    usernameLabel.place(x=350,y=150)
                    passwordLabel = Label(self, text="Password",width=20,font=("bold", 10))
                    passwordLabel.place(x=350,y=175)
                    genderLabel = Label(self, text="Gender",width=20,font=("bold", 10))
                    genderLabel.place(x=350,y=200)
                    countryLabel = Label(self, text="Country",width=20,font=("bold", 10))
                    countryLabel.place(x=350,y=225)
                    start_page = ttk.Button(self, text="Start Page", command=lambda:controller.show_frame(StartPage))
                    start_page.place(x=25,y=25)
                    page_one = ttk.Button(self, text="Page One", command=lambda:controller.show_frame(PageOne))
                    page_one.place(x=25,y=50)
                    page_two = ttk.Button(self, text="Page Two", command=lambda:controller.show_frame(PageTwo))
                    page_two.place(x=25,y=75)


    def database():
                    Username = username.get()
                    Password = password.get()
                    Gender = gender.get()
                    Country = country.get()
                    Animal = animal.get()
                    FirstName = firstName.get()
                    SecondName = secondName.get()
                    conn = sqlite3.connect('Database1.db')
                    with conn:
                            cursor=conn.cursor()
                    cursor.execute('CREATE TABLE IF NOT EXISTS Student (FirstName TEXT,SecondName TEXT,Gender TEXT,Country TEXT,Animal TEXT,username TEXT,password TEXT)')
                    cursor.execute('INSERT INTO Student (FirstName,SecondName,Gender,Country,Animal,Username,Password) VALUES(?,?,?,?,?,?,?)',(FirstName,SecondName,Gender,Country,Animal,Username,Password))
                    conn.commit()

    class PageTwo(Frame):
            def __init__(self, parent, controller):
                    Frame.__init__(self, parent)

                    label = Label(self, text="Page Two")
                    label.place(x=30,y=5)
                    start_page = ttk.Button(self, text="Start Page", command=lambda:controller.show_frame(StartPage))
                    start_page.place(x=25,y=25)
                    page_one = ttk.Button(self, text="Page One", command=lambda:controller.show_frame(PageOne))
                    page_one.place(x=25,y=50)
                    page_two = ttk.Button(self, text="Page Two", command=lambda:controller.show_frame(PageTwo))
                    page_two.place(x=25,y=75)

    class MainMenu:
            def __init__(self, master):
                    menubar = Menu(master)
                    filemenu = Menu(menubar, tearoff=0)
                    filemenu.add_command(label="Exit", command=master.quit)
                    menubar.add_cascade(label="File", menu=filemenu)
                    master.config(menu=menubar)


    app=App()
    app.geometry("1900x1000+0+0")
    app.mainloop()

所以基本上这就是我的主程序的窗口，然后我试图在帐户的“第一页”注册中实现，然后在另一页上实现登录功能，但是现在我只显示注册程序，因为我不这样做在第一页上知道如何实现。

  from tkinter import *
  import sqlite3

  root = Tk()
  root.geometry('800x400')
  root.title("Membership Application")


  username=StringVar()
  password=StringVar()
  gender=StringVar()
  country=StringVar()
  animal=StringVar()
  firstName=StringVar()
  secondName=StringVar()

  def database():
     Username=username.get()
     Password=password.get()
     Gender=gender.get()
     Country=country.get()
     Animal=animal.get()
     FirstName=firstName.get()
     SecondName=secondName.get()
     conn = sqlite3.connect('Database1.db')
     with conn:
        cursor=conn.cursor()
     cursor.execute('CREATE TABLE IF NOT EXISTS Student (FirstName TEXT,SecondName TEXT,Gender TEXT,Country TEXT,Animal TEXT,username TEXT,password TEXT)')
     cursor.execute('INSERT INTO Student (FirstName,SecondName,Gender,Country,Animal,Username,Password) VALUES(?,?,?,?,?,?,?)',(FirstName,SecondName,Gender,Country,Animal,Username,Password))
     conn.commit()

  title = Label(root, text="Registration form",width=20,font=("bold", 20))
  title.place(x=90,y=53)

  firstNameLabel = Label(root, text="First Name",width=20,font=("bold", 10))
  firstNameLabel.place(x=50,y=100)

  firstNameEntry = Entry(root,textvar=firstName)
  firstNameEntry.place(x=200,y=100)

  secondNameLabel = Label(root, text="Second Name",width=20,font=("bold", 10))
  secondNameLabel.place(x=50,y=125)

  secondNameEntry = Entry(root,textvar=secondName)
  secondNameEntry.place(x=200,y=125)

  usernameLabel = Label(root, text="Username",width=20,font=("bold", 10))
  usernameLabel.place(x=350,y=100)

  usernameEntry = Entry(root,textvar=username)
  usernameEntry.place(x=500,y=100)

  passwordLabel = Label(root, text="Password",width=20,font=("bold", 10))
  passwordLabel.place(x=350,y=125)

  passwordEntry = Entry(root,textvar=password, show ="*")
  passwordEntry.place(x=500,y=125)

  genderLabel = Label(root, text="Gender",width=20,font=("bold", 10))
  genderLabel.place(x=70,y=230)

  Radiobutton(root, text="Male",padx = 5, variable=gender, value="Male").place(x=235,y=230)
  Radiobutton(root, text="Female",padx = 20, variable=gender, value="Female").place(x=290,y=230)

  countryLabel = Label(root, text="Country",width=20,font=("bold", 10))
  countryLabel.place(x=70,y=280)

  countryList = ['Canada','India','UK','Nepal','Iceland','South Africa'];

  droplist=OptionMenu(root,country, *countryList)
  droplist.config(width=15)
  country.set('Select your country') 
  droplist.place(x=240,y=280)

  label_4 = Label(root, text="Animals",width=20,font=("bold", 10))
  label_4.place(x=85,y=330)
  animal2= IntVar()
  Checkbutton(root, text="Dog", variable=animal).place(x=235,y=330)
  Checkbutton(root, text="Cat", variable=animal2).place(x=290,y=330)

  Button(root, text='Submit',width=20,bg='brown',fg='white',command=database).place(x=500,y=280)

  root.mainloop()

最后一点不会变成代码，但这仍然是注册程序的一部分。 因此，基本上，我如何实现此目标，我尝试了多种方法来尝试访问输入框并使数据库也正常工作，但这只是没有合并在一起，我无处可寻，无法解释如何完成此特定任务每帧都有不同的功能。