获取嵌套框架以填充已填充的父单元格内的剩余窗口空间

任何人都可以帮助我让我的嵌套框架在其父单元格内填充剩余的窗口空间吗？我创建了应用程序窗口，给它一个容器，根据有多少页面给容器提供 2 行和动态列。我的容器是父容器。通过为第二行赋予权重 1 并使第一列扩展到所有可用列，我已经能够用父单元格填充窗口。然后我将嵌套框架（这是页面）插入第二行，在第一行中每个页面的按钮下方。但是，即使我删除了所有网格用法，我似乎也遇到了包和网格层次结构的问题。这就像 tk.Tk() 在调用时由网格自动控制。

第 41 行似乎是我可以在页面上进行包装填充和扩展的地方。但它会导致层次结构错误，即使在删除所有网格使用并用包替换必要的网格之后。通过使用网格，它在没有这条线的情况下运行良好。只是无法填充/扩展

import tkinter as tk
from tkinter import font as tkfont


class Application(tk.Tk):

    def __init__(self, title, page_list):
        tk.Tk.__init__(self)

        self.minsize(500, 500)
        self.maxsize(500, 500)
        self.update_idletasks()
        self.title_font = tkfont.Font(family="Helvetica", size=10, weight="bold", slant="italic")

        self.title(title)

#    Create the main container. Row 1 holds page buttons. Row 2 is for the page frame.
        container = tk.Frame(self)
        container.configure(bg="red")
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(1, weight=1)
        container.grid_columnconfigure(len(page_list), weight=1)

#    Begin making the pages and put them in a dictionary to grab by name.
        self.pages = {}
        self.p_names = page_list
        for P in self.p_names:
            page_name = P.__name__
            page = P(parent=container, controller=self, title=page_name.strip("Page"))
            self.pages[page_name] = page
#    Make the buttons from the page list provided
        self.create_buttons(container, self)

        self.show_page(str(self.p_names[0].__name__), self.currentPage)

    def show_page(self, page_name, button):
        self.currentPage.configure(relief="raised", bg="red", fg="black")
        page = self.pages[page_name]

#    Put the page in row 1 below the buttons, in the top left. Expand it so it fills the remainder of the cell/window
        #page.pack(side="top", fill="both", expand="true") #This line will cause error when uncommented.
        page.grid(row=1, columnspan=len(self.pages), sticky="nw")

        for p in self.pages:
            if p != page_name:
                self.pages[p].grid_forget()
        button.configure(relief="sunken", bg="black", fg="white")
        self.currentPage = button

    def create_buttons(self, s, controller):
        pgs = len(self.p_names)*3
#    need to figure out how to accurately get window width and use it properly for button width division
        pages = {}

        for i,p in enumerate(self.p_names):
            pages[i] = tk.Button(s, text=p.__name__.strip("Page"), fg="Black", bg="red",
                                 width=(self.winfo_reqwidth() // pgs) + 1,
                                 command=lambda i=i, p=p: controller.show_page(p.__name__, pages[i]))
            pages[i].grid(row=0, column=i)
        self.currentPage = pages[0]


class NewPage(tk.Frame):
    def __init__(self, parent, controller, title):
        self.title = title
        tk.Frame.__init__(self, parent, bg="Black")
        self.controller = controller

#    Create Page Title Label
        pageTitle = tk.Label(self, text=self.title, font=controller.title_font, bg="Black", fg="white")
#    Attempt to fill cell that page is in
        pageTitle.pack(fill="both", expand="true")
        pageTitle.grid_columnconfigure(1, weight=1)
        pageTitle.grid_rowconfigure(1, weight=1)
#    Pad the page title
        pageTitle.grid(row=0, column=0, pady=10, padx=10, sticky="nsew")


        #extraLabel = tk.Label(self, text="test", bg="blue")
        #extraLabel.grid(row=1, column=1, pady=5, padx=5, sticky="nsew")


class CharacterPage(NewPage):
    def __init__(self, parent, controller, title):
        super().__init__(parent, controller, title)


class OptionsPage(NewPage):
    def __init__(self, parent, controller, title):
        super().__init__(parent, controller, title)


class InventoryPage(NewPage):
    def __init__(self, parent, controller, title):
        super().__init__(parent, controller, title)


class RandomPage(NewPage):
    def __init__(self, parent, controller, title):
        super().__init__(parent, controller, title)


def main():
    app = Application("Game Title Here", [CharacterPage, InventoryPage, OptionsPage])
    app.mainloop()


main()

应该发生的是页面，因为它的背景是黑色的，应该以黑色覆盖单元格/窗口的其余部分。着色是让我在视觉上看到它正在工作，而不仅仅是使背景变黑。该页面最终将填充其他元素。

我是否缺少有关包装或网格的信息？我对使用它们很陌生。大约只有一个星期或两个星期。在嵌套框架填充中找不到任何内容。