I know, this topic has been adressed in several threads, e.g. this one: Tkinter how to continuously update a label, I looked through them, but what I found did not work for me. I try to update a Label with an image into which I write a new text periodically, i.e. without any event like click, enter. I tried binding the tkinter to the update method (s. variant 1 in code) here I generate a dummy event and I tried the "after" method (variant 2 in code) but it also didn't work. Below is a minimal example. How do I manage to update this picture with text periodically?
#!/usr/bin/python# -*- coding: utf-8 -*-'''Display- Show handling hints, minimal example'''import tkinterimport osfrom PIL import Image, ImageTk, ImageDraw, ImageFontimport threading, timeimport sysroot_path = r"some_path"sys.path.append(root_path)import versionclass Display: def __init__(self): self.base_path_img = os.path.join(root_path, "Images/") self.teststep_image_name = "teststep.jpg" self.teststep_name = "teststep_init" self.button_height = 2 self.button_width = 20 self.window_width = 900 self.teststep_height = 700 self.frame_height = 500 self.logo_height = 50 self.logo_width = 100 self.window_size = str(self.window_width) +"x400" self.grid_columns = 3 # vertical self.grid_rows = 3 # horizontal self.displ = tkinter.Tk() self.displ.maxsize = self.window_width self.teststep_text = "TestStep init" self.step_label_init() self.update_time = 1 self.update_tuple = (self.teststep_image_name, self.teststep_text) self.n_calls = 0 self.displ.after(self.update_time, self.update_img_teststep) self.displ.mainloop() def step_label_init(self):'''Configure Label for Teststep display with image and text''' self.teststep_image = self.open_tk_image(self.teststep_image_name, self.window_width, self.teststep_height, self.teststep_text) self.TestStep_Label = tkinter.Label( self.displ, bg = "white", height = self.frame_height, width = self.window_width, image = self.teststep_image) self.TestStep_Label.grid_configure( row = 2, column = 1, columnspan = 3, sticky = tkinter.NSEW) #variant 2 #self.TestStep_Label.after(1000, self.update_img_teststep, "") def open_tk_image(self, img_name, img_width, img_height, test_text = ""): pil_image = Image.open(self.base_path_img + img_name, "r").resize((img_width, img_height)) img_draw = ImageDraw.Draw(pil_image) textwidth = 20 textheight = 50 x = img_width // 4 - textwidth y = img_height // 5 - textheight img_draw.text((x, y), test_text, fill="yellow", font_size=30) tk_image = ImageTk.PhotoImage(pil_image) pil_image.close() return tk_image def update_img_teststep(self, input_ign): #dummy argument print(input_ign) img_name = self.update_tuple[0] teststep_text = self.update_tuple[1] +"number of calls: " + str(self.n_calls) self.teststep_image = self.open_tk_image(img_name, self.window_width, self.teststep_height, teststep_text) self.TestStep_Label.configure(image = self.teststep_image) self.n_calls += 1 def displ_config(self): #test start for i in range(1,3): time.sleep(self.update_time) print(f'slept, now i is {i}') self.update_tuple = ("teststep"+str(i)+".jpg", "this is text #" + str(i)) self.displ.configure(bg = "black") #test end# import time# import threadingif __name__ == "__main__": displ = Display() #https://stackoverflow.com/questions/70355318/tkinter-how-to-continuously-update-a-labelAs described above, I tried binding tkinter.Tk() to the update method and generating a dummy event that would trigger the binding function. And I tried using the method "after" with self.displ and with the self.TestStep_Label. The second variant should have solved the problem immediately, the first variant would have needed some additional waiting calls. But actually, none of both helped.