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I'm trying to display/include a function display_srv on a click from the menu bar command and get values of each checkbox selected with the button Done

import tkinter as tk
import glob
from tkinter import *

def frame_1():
 print("frame 1!")

The function I tried to display in the frame:

def display_srv():
 frame_1 = root.LabelFrame(root, text="Liste Serveurs")
 frame_1.grid(row=0, sticky='ew', padx=20, pady=20, ipadx=5, ipady=5)
 path = '/home/lst/*.txt'
 files=glob.glob(path)
 count = 0
 for file in files:
 with open(file, 'r') as lst_file:
 for item in lst_file:
 lng = root.Checkbutton(frame_1, variable = item, text=item.rstrip()).grid(row=count//10, column=count%10)
 count += 1

Text file value:

item1
item2
item3
...
item100

The function to get values:

def getvalue():
 print(list(lng.values()))

The main script:

root = Tk()
menu = Menu(root)
root.geometry('700x500')
root.title("My menu")
root.config(menu=menu)
testpsimenu = Menu(menu)
menu.add_cascade(label="Test Menu", menu=testpsimenu, font=("Arial", 12))
testpsimenu.add_command(label="Select 1", font=("Arial", 10), command=frame_1)
testpsimenu.add_separator()
testpsimenu.add_command(label="Select 2", font=("Arial", 10), command=display_srv)

psimenu = Menu(menu)
menu.add_cascade(label="PSI Real", menu=psimenu, font=("Arial", 12))
psimenu.add_command(label="Select 1", font=("Arial", 10), command=frame_1)
psimenu.add_separator()
psimenu.add_command(label="Select 2", font=("Arial", 10), command=frame_1)

exitmenu = Menu(menu)
menu.add_cascade(label="Exit", menu=exitmenu, font=("Arial", 12))
exitmenu.add_command(label="Exit", command=root.quit, font=("Arial", 10))

Button(root, text='Done', font=("Arial", 12), command=getvalue).pack(side=RIGHT)

mainloop()

This is the error, when I click on Select2 from the menu testpsi:

Exception in Tkinter callback
Traceback (most recent call last):
 File "/usr/lib64/python3.6/tkinter/__init__.py", line 1702, in __call__
 return self.func(*args)
 File "./test_menu_7.py", line 13, in display_srv
 frame_1 = root.LabelFrame(root, text="Liste Serveurs")
 File "/usr/lib64/python3.6/tkinter/__init__.py", line 2098, in __getattr__
 return getattr(self.tk, attr)
AttributeError: '_tkinter.tkapp' object has no attribute 'LabelFrame'

Many thanks for your help...

I can see 2 problems so far.

1. You need to use the tk. prefix on your widgets and not root.

Change these:

root.LabelFrame
root.Checkbutton

To these:

tk.LabelFrame
tk.Checkbutton

2. You need to define lng as a global variable so it can be used in your getvalue() function.

Add this line global lng to the top of display_srv() like this:

def display_srv():
 global lng

Let me know if you have any questions.