Is there a way to print list of lists in tkinter label?

Question

I have a code where I am trying to print list of lists in tkinter label but it doesn't work the way I want. When I run the script below it will search the entered text in list.txt and print it in tkinter label. As more text is entered, the previous searched text should clear and new text should appear based on search results in list.txt file. But the previous text doesn't get cleared.Here's a partial code:

    import tkinter as tk
import re
from tkinter import Label

class App(tk.Tk):
    def __init__(self):
        super().__init__()
        self.var = tk.StringVar()
        self.var.trace("w", self.show_message)
        self.entry = tk.Entry(self, textvariable=self.var)
        self.label = tk.Label(self)
        self.entry.pack()
        self.label.pack()
    def show_message(self, *args):
        value = self.var.get()
        scen = []
        text = "{}".format(value) if value else scen.clear()
        if text:
            words = re.split('[ ]', text.lower())
            with open('list.txt','r') as mfl:
                scen.clear()
                for line in mfl:
                    if all(word in line.lower() for word in words):
                        txt = re.split("[._ -]",line)
                        scen.append(txt[:-1])
        for i in range(len(scen)):
            exec('Label%d=Label(app,text="%s")\nLabel%d.pack()'%(i,scen[i],i))


if __name__ == "__main__":
    app = App()
    app.mainloop()

Answer 1

Standard rule:

"if you have many elements then keep them on list"    

You should keep labels on list and then you don't have to use exec() to create variables Label%d and later you can use for-loop to destroy() all labels before you add new labels.

import tkinter as tk
import re
from tkinter import Label

class App(tk.Tk):

    def __init__(self):
        super().__init__()
        self.var = tk.StringVar()
        self.var.trace("w", self.show_message)
        self.entry = tk.Entry(self, textvariable=self.var)
        self.label = tk.Label(self)
        self.entry.pack()
        self.label.pack()

        # list for all labels
        self.all_labels = []


    def show_message(self, *args):
        text = self.var.get()
        scen = []
        if text:
            words = text.lower().split(' ')
            with open('list.txt') as mfl:
                scen.clear()
                for line in mfl:
                    if all(word in line.lower() for word in words):
                        txt = re.split("[._ -]", line)
                        scen.append(txt[:-1])

        # remove all labels
        for item in self.all_labels:
            item.destroy()
        self.all_labels.clear()   # remove references to old labels (as @acw1668  noticed in comment)

        # add new labels
        for item in scen:
            l = tk.Label(self, text=item)
            l.pack()
            self.all_labels.append(l)

if __name__ == "__main__":
    app = App()
    app.mainloop()