Python 2.7: Tkinter: Classes - Attribute Error [duplicate] - python-2.7

Question

This question already has answers here:
Tkinter: AttributeError: NoneType object has no attribute <attribute name>
(4 answers)
Closed 7 years ago.
Hello I am making a GUI for a program with Tkinter, but I keep getting an error:
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1470, in __call__
return self.func(*args)
File "C:\Users\jorge\Desktop\new 1.py", line 53, in browse_button
self.browse_entry.delete(0,END)
AttributeError: 'NoneType' object has no attribute 'delete'"
I am a noobie what it comes to classes so I don't know what I'm making wrong.
If you could help me I would appreciate it.
Thanks in advance!!
from Tkinter import *
from tkFileDialog import *
import ttk,os
class App(Tk):
def __init__(self, *args, **kwargs):
Tk.__init__(self, *args, **kwargs)
self.title("Subtitles Master")
self.iconbitmap(default = r"C:\Users\jorge\Desktop\Programas Python\notepad.ico")
mainframe = Frame(self)
mainframe.pack(side = "top")
mainframe.grid_rowconfigure(0, weight = 1)
mainframe.grid_columnconfigure(0, weight = 1)
self.frames = {}
for F in (StartPage, Timing):
frame = F(mainframe, self)
self.frames[F] = frame
frame.grid (row = 0, column = 0, sticky = "nsew")
self.show_frame(StartPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class StartPage(Frame):
def __init__(self, parent, controller):
Frame.__init__(self, parent)
filler1 = Frame(self, width = 30, height = 20).grid(column = 4, row = 0, rowspan = 2)
syncsubs_button = ttk.Button(self, text = "Sync Subtitles", state = DISABLED).grid(column = 5, row = 0)
timing_button = ttk.Button(self, text = "Edit Timing", command = lambda: controller.show_frame(Timing)).grid(column = 5, row = 1)
filler2 = Frame(self, width = 20, height = 20).grid(column = 6, row = 0, rowspan = 2)
syncsubs_label= Label(self, font = ("Alien Encounters", 20), text = "Sync Subtitles", fg = "dark green").grid(row = 2, columnspan = 6)
browse_label = Label(self, font = ("Calibri",12), text = "Subtitles to sync:").grid(row = 3, column = 0, sticky = "w")
filename1 = StringVar()
self.browse_entry = Entry(self, textvariable = filename1, width = 50).grid(row = 4, column = 1, columnspan = 5)
browse_button = ttk.Button(self, text = "Browse", command = self.browse_button).grid(row = 4, column = 0)
def browse_button(self):
filename = askopenfilename(title = "Choose a file",filetypes = (("Subtitles", "*.srt"), ("Text", "*.txt")))
self.browse_entry.delete(0,END)
self.browse_entry.insert(0,filename)
return filename
class Timing(Frame):
def __init__(self, parent, controller):
Frame.__init__(self, parent)
filler1 = Frame(self, width = 30, height = 20).grid(column = 4, row = 0, rowspan = 2)
syncsubs_button = ttk.Button(self, text = "Sync Subtitles", command = lambda: controller.show_frame(StartPage)).grid(column = 5, row = 0)
timing_button = ttk.Button(self, text = "Edit Timing", state = DISABLED).grid(column = 5, row = 1)
filler2 = Frame(self, width = 20, height = 20).grid(column = 6, row = 0, rowspan = 2)
syncsubs_label= Label(self, font = ("Alien Encounters", 20), text = "Edit Timing", fg = "dark red").grid(row = 2, columnspan = 6)
window = App()
window.mainloop()

Answer 1

The problem is this line:
# returns None (Entry.grid(...))
self.browse_entry = Entry(self, textvariable = filename1, width = 50).grid(row = 4, column = 1, columnspan = 5)
Change to two lines:
# returns entry
self.browse_entry = Entry(self, textvariable = filename1, width = 50)
# do stuff with entry
self.browse_entry.grid(row = 4, column = 1, columnspan = 5)