[Tkinter] Text Upload

[LearningLittlebyLittle]

I have an Ubuntu OS, and I am trying to create a GUI to display all the text files in the directory. It should have buttons for each text files, and each button when clicked on it should display each text file. However, I am trying to get it work, and it only displays one text file however I passed all the text files into the class. Any ideas? Or do I need to create a class for every text file?

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from tkinter import * import os LARGEFONT = ("Verdana", 35)     class tkinterApp(Tk):       # __init__ function for class tkinterApp      def __init__(self):         # __init__ function for class Tk         Tk.__init__(self)           # creating a container         container = Frame(self)         container.pack(side="top", fill="both", expand=True)           container.grid_rowconfigure(0, weight=1)         container.grid_columnconfigure(0, weight=1)           # initializing frames to an empty array         self.frames = {}           os.chdir('/home/josemserrajr/ToDoList')         for root,dir,file in os.walk('.'):             self.files = file         for i in self.files:             brkpt = i.find('.txt')             word = i[:brkpt]             frame = txtPage(container,self,file=i)             self.frames[word] =  frame             frame.grid(row=0, column=0, sticky="nsew")         frame = StartPage(container, self)         self.frames[StartPage] = frame           frame.grid(row=0, column=0, sticky="nsew")               # initializing frame of that object from             # startpage, page1, page2 respectively with              # for loop                 self.show_frame(StartPage)           # to display the current frame passed as       # parameter     def show_frame(self, cont):         frame = self.frames[cont]         frame.tkraise()       # first window frame startpage     class StartPage(Frame):     def __init__(self, parent, controller):         Frame.__init__(self, parent)           # label of frame Layout 2         label = Label(self, text="Startpage", font=LARGEFONT)           # putting the grid in its place by using         # grid         label.grid(row=0, column=4, padx=10, pady=10)         os.chdir('/home/josemserrajr/ToDoList')         for root, dir, file in os.walk('.'):             self.files = file         for i in self.files:             brkpt = i.find('.txt')             word = i[:brkpt]             Button(self, text=i,                              command=lambda: controller.show_frame(word)).grid()           # second window frame page1     class txtPage(Frame):       def __init__(self, parent, controller,file):         Frame.__init__(self, parent)         label = Label(self, text="Page 1", font=LARGEFONT)         label.grid(row=0, column=4, padx=10, pady=10)         os.chdir('/home/josemserrajr/ToDoList')         print(file)         opfil = open(file,'r')         # button to show frame 2 with text         # layout2         Label(self,text=opfil.read()).grid()         button1 = Button(self, text='Start Page',                              command=lambda: controller.show_frame(StartPage))           # putting the button in its place          # by using grid         opfil.close()         button1.grid(row=1, column=1, padx=10, pady=10)     # Driver Code     app = tkinterApp() app.mainloop()