python - Entry widget: avoid more than one searchbar -

in code there 2 buttons - when click on first, program writes window "home", second writes window "search" , under "search" create searchbar. problem is, when click on search button twice (or more times) searchbar created more times too. how can fix it? (i want there 1 searchbar).

from tkinter import *  class app():     def __init__(self):              self.window = tk()          self.text=label(self.window, text="some text")         self.text.pack()         button_home = button(self.window, text='home',command= self.home)         button_home.pack()         button_search = button(self.window, text='search', command=self.search)         button_search.pack()      def home(self):         self.text['text'] = 'home'      def search(self):         self.text["text"] = 'search'         meno = stringvar()         m = entry(self.window, textvariable=meno).pack() 

all have here add variable represents whether or not application's entry has been created yet:

class app():     def __init__(self):              self.window = tk()          self.text=label(self.window, text="some text")         self.text.pack()         button_home = button(self.window, text='home',command= self.home)         button_home.pack()         button_search = button(self.window, text='search', command=self.search)         button_search.pack()          self.has_entry = false      def home(self):         self.text['text'] = 'home'      def search(self):         self.text["text"] = 'search'         if not self.has_entry:             self.meno = stringvar() # note - change meno self.meno can                                       # access later attribute             m = entry(self.window, textvariable=self.meno).pack()             self.has_entry = true 

to go further, instead make home , search buttons control whether or not entry widget displayed. using .pack , .pack_forget methods of entry:

class app():     def __init__(self):              self.window = tk()          self.text=label(self.window, text="some text")         self.text.pack()         button_home = button(self.window, text='home',command= self.home)         button_home.pack()         button_search = button(self.window, text='search', command=self.search)         button_search.pack()          self.meno = stringvar()         self.entry = entry(self.window, textvariable=self.meno)      def home(self):         self.text['text'] = 'home'         self.entry.pack_forget()      def search(self):         self.text["text"] = 'search'         self.entry.pack() 

hope helps!