tkinter how to use after method

Question

Hey I am new to python and am using tkinter for my gui  I am having trouble using the  after  method  The goal is to make a random letter appear every 5 seconds   Here is my code   import random import time from tkinter import     root   Tk    w   Label root  text  GAME   w pack    frame   Frame root  width 300  height 300  frame pack    L1   Label root  text  User Name   L1 pack side LEFT  E1   Entry root  bd  5  E1 pack side LEFT    tiles letter     a    b    c    d    e     while len tiles letter   gt  0      rand   random choice tiles letter      tile frame   Label frame  text rand      tile frame pack       frame after 500      tiles letter remove rand     remove that tile from list of tiles  root mainloop     can someone please help me --- the problem is definitely frame after 500   i m not sure if it is correct to use  frame  and I don t know what which argument follows the 500   Thanks

User · Answer

I believe  the 500ms run in the background  while the rest of the code continues to execute and empties the list  Then after 500ms nothing happens  as no function-call is implemented in the after-callup  same as frame after 500  function None

User · Answer

You need to give a function to be called after the time delay as the second argument to after      after delay ms  callback None   args       Registers an alarm callback that is called after a given time    So what you really want to do is this   tiles letter     a    b    c    d    e    def add letter        rand   random choice tiles letter      tile frame   Label frame  text rand      tile frame pack       root after 500  add letter      tiles letter remove rand     remove that tile from list of tiles   root after 0  add letter     add letter will run as soon as the mainloop starts  root mainloop     You also need to schedule the function to be called again by repeating the call to after inside the callback function  since after only executes the given function once  This is also noted in the documentation      The callback is only called once for each call to this method  To keep   calling the callback  you need to reregister the callback inside   itself   Note that your example will throw an exception as soon as you ve exhausted all the entries in tiles letter  so you need to change your logic to handle that case whichever way you want  The simplest thing would be to add a check at the beginning of add letter to make sure the list isn t empty  and just return if it is   def add letter        if not tiles letter          return     rand   random choice tiles letter      tile frame   Label frame  text rand      tile frame pack       root after 500  add letter      tiles letter remove rand     remove that tile from list of tiles     Live-Demo  repl it

[python] tkinter: how to use after method

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