Python, Tkinter, SQlite3 after login successful redirecting the user to a new window -

i'm new within programming , created following source code verify if user logs in successfully. want redirect user new window , rid of current window, after input correct credentials within entries. possible use top-level method this?

def is_valid():      usernamevalidity=username_entry.get()             passwordvalidity=password_entry.get()     cursor.execute('''select password users username = ?''', (usernamevalidity,))     cursor.execute('''select username users password = ?''', (passwordvalidity,))     loginattempt = cursor.fetchone()?     print (is_valid) # testing      if loginattempt:         print (" 1 of accounts have logged in ")         isvalidtext.config(text=" have logged in! ", fg="black", highlightthickness=1)     else:?         print (" 1 of accounts inputted wrong credentials! ")         isvalidtext.config(text=" invalid username or password! ", fg="black", highlightthickness=1) 

assuming program works point, more welcome use toplevel method. include .after() give time let user see message.

def newpage():     global newroot     root.withdraw() # hide (close) root/tk window     newroot = tk.toplevel(root)     # use newroot root  def is_valid():     # same before...     if loginattempt:         print (" 1 of accounts have logged in ")         isvalidtext.config(text=" have logged in! ", fg="black", highlightthickness=1)         root.after(2000, newpage) # or whatever tk called         # redirect newpage function after 2 seconds      else:         print (" 1 of accounts inputted wrong credentials! ")         isvalidtext.config(text=" invalid username or password! ", fg="black", highlightthickness=1) 

this close original window , pop new blank window. note: .after(ms, callback) uses ms, 2000ms = 2sec

and want rid of 2 random question marks after cursor.fetchone() , else.