[Tkinter] Having trouble updating the text in a label

[microphone_head]

Hi all,

Having trouble updating the text in a label .

I've created a tkinter window and created an update routine, but its not obvious to myself as to how to set the attributes . Any suggestions?

import tkinter as tk
import pygame

pygame.init()

pwbr_power = 0
pwbr_duration = 0
pwbr_scrn_refresh = 0
pwbr_elps_time = 0
pwbr_ttl_sec = 0

class Application(tk.Frame):
    def __init__(self, master=None):
        tk.Frame.__init__(self, master)
        self.grid()
        self.createwidgets()
    # __init__() ---------------------------------------------------------------

    def createwidgets(self):
        """
        Creates the numerous widgets that make up the form.
        """
        
        global pwbr_power, pwbr_duration, pwbr_scrn_refresh, pwbr_elps_time
        global pwbr_ttl_sec
        
        pwbr_power += 1
        pwbr_duration += 0.15
        pwbr_elps_time += pwbr_duration
        pwbr_scrn_refresh = 0.333
        pwbr_ttl_sec += pwbr_elps_time

        if pwbr_elps_time > pwbr_scrn_refresh:
            pwbr_elps_time = 0
            pwbr_duration = 0

        caption_pwr = "Power: " + str(pwbr_power)
        caption_dur = "Duration: " + str(pwbr_duration)
        caption_rfrsh =  "Screen Refresh: " + str(pwbr_scrn_refresh)
        caption_etime = "Elapsed time: " + str(pwbr_elps_time)
        caption_ttl = "Total sec's: " + str(pwbr_ttl_sec)
        
        self.lblpower = tk.Label(self, text=caption_pwr, fg="black")
        self.lblduration = tk.Label(self, text=caption_dur, fg="black")
        self.lblrefreshrate = tk.Label(self, text=caption_rfrsh, fg="black")
        self.lbletime = tk.Label(self, text=caption_etime, fg="black")
        self.lbltotalsec = tk.Label(self, text=caption_ttl, fg="black")
        
        self.quitButton = tk.Button(self, text='Quit', command=self.quit)
        
        self.lblpower.grid()
        self.lblduration.grid()
        self.lblrefreshrate.grid()
        self.lbletime.grid()
        self.lbltotalsec.grid()
        self.quitButton.grid()
        
        self.after(1000, self.update)
    # createwidgets() ----------------------------------------------------------
    

    def update(self):
        """
        Updates the status information in the tkinter window.
        """
        
        global pwbr_power, pwbr_duration, pwbr_scrn_refresh, pwbr_elps_time
        global pwbr_ttl_sec
        
        pwbr_power += 1
        pwbr_duration += 0.15
        pwbr_elps_time += pwbr_duration
        pwbr_scrn_refresh = 0.333
        pwbr_ttl_sec += pwbr_elps_time

        if pwbr_elps_time > pwbr_scrn_refresh:
            pwbr_elps_time = 0
            pwbr_duration = 0

        caption_pwr = "Power: " + str(pwbr_power)
        caption_dur = "Duration: " + str(pwbr_duration)
        caption_rfrsh =  "Screen Refresh: " + str(pwbr_scrn_refresh)
        caption_etime = "Elapsed time: " + str(pwbr_elps_time)
        caption_ttl = "Total sec's: " + str(pwbr_ttl_sec)

        self.lblpower.text = "1234"
##        self.lblduration = tk.Label(self, text=caption_dur, fg="black")
##        self.lblrefreshrate = tk.Label(self, text=caption_rfrsh, fg="black")
##        self.lbletime = tk.Label(self, text=caption_etime, fg="black")
##        self.lbltotalsec = tk.Label(self, text=caption_ttl, fg="black")
##        
##        self.quitButton = tk.Button(self, text='Quit', command=self.quit)

        self.after(1000, self.update)
    # fn_pbtkwin_update() ----------------------------------------------------------
# Application() ----------------------------------------------------------------


app = Application()
app.master.title("Power Bar")
app.mainloop()


pygame.time.wait(1000)
pygame.display.set_mode((640, 480))

quit_loop = False
while quit_loop is not True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:  # If user clicked close
            quit_loop = True  # Flag that we are done so we exit this loop
        elif event.type == pygame.MOUSEBUTTONUP:
            pass
        elif event.type == pygame.constants.KEYDOWN:
            if event.key == pygame.constants.K_ESCAPE:
                quit_loop = True
                break
            elif event.key == pygame.constants.K_LEFT:
                kbd["left"] = True
            elif event.key == pygame.constants.K_RIGHT:
                kbd["right"] = True
            elif event.key == pygame.constants.K_UP:
                kbd["up"] = True
            elif event.key == pygame.constants.K_DOWN:
                kbd["down"] = True
            elif event.key == pygame.constants.K_SPACE:  # Fire.
                kbd["fire"] = True
            elif event.key == pygame.constants.K_LCTRL:  # Thrust.
                kbd["thrust"] = True
            elif event.key == pygame.constants.K_r:
                kbd["overload"] = True
        elif event.type == pygame.constants.KEYUP:
            if event.key == pygame.constants.K_LEFT:
                kbd["left"] = False
            elif event.key == pygame.constants.K_RIGHT:
                kbd["right"] = False
            elif event.key == pygame.constants.K_UP:
                kbd["up"] = False
            elif event.key == pygame.constants.K_DOWN:
                kbd["down"] = False
            elif event.key == pygame.constants.K_SPACE:  # Fire.
                kbd["fire"] = False
            elif event.key == pygame.constants.K_LCTRL:  # Thrust.
                kbd["thrust"] = False
            elif event.key == pygame.constants.K_r:
                kbd["overload"] = False
            # end if
        # end if
    # end for loop

    # { Paint some graphics on the screen.
    #   ...
    # }.
    pygame.display.flip()
# end while loop

---

That was brutal . Took a while but I got there in the end. Turns out they use a config method. Had a few passed at skimming the reference document Tkinter 8.5 and didn't see it.

import tkinter as tk
import pygame

pygame.init()

pwbr_power = 0
pwbr_duration = 0
pwbr_scrn_refresh = 0
pwbr_elps_time = 0
pwbr_ttl_sec = 0

class Application(tk.Frame):
    def __init__(self, master=None):
        tk.Frame.__init__(self, master)
        self.grid()
        self.createwidgets()
    # __init__() ---------------------------------------------------------------

    def createwidgets(self):
        """
        Creates the numerous widgets that make up the form.
        """
        
        global pwbr_power, pwbr_duration, pwbr_scrn_refresh, pwbr_elps_time
        global pwbr_ttl_sec
        
        pwbr_power += 1
        pwbr_duration += 0.15
        pwbr_elps_time += pwbr_duration
        pwbr_scrn_refresh = 0.333
        pwbr_ttl_sec += pwbr_elps_time

        if pwbr_elps_time > pwbr_scrn_refresh:
            pwbr_elps_time = 0
            pwbr_duration = 0

        caption_pwr = "Power: " + str(pwbr_power)
        caption_dur = "Duration: " + str(pwbr_duration)
        caption_rfrsh =  "Screen Refresh: " + str(pwbr_scrn_refresh)
        caption_etime = "Elapsed time: " + str(pwbr_elps_time)
        caption_ttl = "Total sec's: " + str(pwbr_ttl_sec)
        
        self.lblpower = tk.Label(self, text=caption_pwr, fg="black")
        self.lblduration = tk.Label(self, text=caption_dur, fg="black")
        self.lblrefreshrate = tk.Label(self, text=caption_rfrsh, fg="black")
        self.lbletime = tk.Label(self, text=caption_etime, fg="black")
        self.lbltotalsec = tk.Label(self, text=caption_ttl, fg="black")
        
        self.quitButton = tk.Button(self, text='Quit', command=self.quit)
        
        self.lblpower.grid()
        self.lblduration.grid()
        self.lblrefreshrate.grid()
        self.lbletime.grid()
        self.lbltotalsec.grid()
        self.quitButton.grid()
        self.update()
        
        self.after(1000, self.update_info)
    # createwidgets() ----------------------------------------------------------
    

    def update_info(self):
        """
        Updates the status information in the tkinter window.
        """
        
        global pwbr_power, pwbr_duration, pwbr_scrn_refresh, pwbr_elps_time
        global pwbr_ttl_sec
        
        pwbr_power += 1
        pwbr_duration += 0.15
        pwbr_elps_time += pwbr_duration
        pwbr_scrn_refresh = 0.333
        pwbr_ttl_sec += pwbr_elps_time

        if pwbr_elps_time > pwbr_scrn_refresh:
            pwbr_elps_time = 0
            pwbr_duration = 0

        caption_pwr = "Power: " + str(pwbr_power)
        caption_dur = "Duration: " + str(pwbr_duration)
        caption_rfrsh =  "Screen Refresh: " + str(pwbr_scrn_refresh)
        caption_etime = "Elapsed time: " + str(pwbr_elps_time)
        caption_ttl = "Total sec's: " + str(pwbr_ttl_sec)

        self.lblpower.config(text=caption_pwr)
        self.lblduration.config(text=caption_dur)
        self.lblrefreshrate.config(text=caption_rfrsh)
        self.lbletime.config(text=caption_etime)
        self.lbltotalsec.config(text=caption_ttl)

        self.after(1000, self.update_info)
    # update_info() ----------------------------------------------------------
# Application() ----------------------------------------------------------------


pygame.display.set_mode((640, 480))

app = Application()
app.master.title("Power Bar")
app.mainloop()



quit_loop = False
while quit_loop is not True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:  # If user clicked close
            quit_loop = True  # Flag that we are done so we exit this loop
        elif event.type == pygame.MOUSEBUTTONUP:
            pass
        elif event.type == pygame.constants.KEYDOWN:
            if event.key == pygame.constants.K_ESCAPE:
                quit_loop = True
                break
            elif event.key == pygame.constants.K_LEFT:
                kbd["left"] = True
            elif event.key == pygame.constants.K_RIGHT:
                kbd["right"] = True
            elif event.key == pygame.constants.K_UP:
                kbd["up"] = True
            elif event.key == pygame.constants.K_DOWN:
                kbd["down"] = True
            elif event.key == pygame.constants.K_SPACE:  # Fire.
                kbd["fire"] = True
            elif event.key == pygame.constants.K_LCTRL:  # Thrust.
                kbd["thrust"] = True
            elif event.key == pygame.constants.K_r:
                kbd["overload"] = True
        elif event.type == pygame.constants.KEYUP:
            if event.key == pygame.constants.K_LEFT:
                kbd["left"] = False
            elif event.key == pygame.constants.K_RIGHT:
                kbd["right"] = False
            elif event.key == pygame.constants.K_UP:
                kbd["up"] = False
            elif event.key == pygame.constants.K_DOWN:
                kbd["down"] = False
            elif event.key == pygame.constants.K_SPACE:  # Fire.
                kbd["fire"] = False
            elif event.key == pygame.constants.K_LCTRL:  # Thrust.
                kbd["thrust"] = False
            elif event.key == pygame.constants.K_r:
                kbd["overload"] = False
            # end if
        # end if
    # end for loop

    # { Paint some graphics on the screen.
    #   ...
    # }.
    pygame.display.flip()
# end while loop

[Larz60+]

which label (to use as example)? you have many

[Yoriz]

You can also treat the option name like a dictionary index

self.lblpower['text']=caption_pwr

Ref
https://docs.python.org/3/library/tkinte...-reference
https://docs.python.org/3/library/tkinte...el-options
or widget variables
https://docs.python.org/3/library/tkinte...-variables

[microphone_head]

which label (to use as example)? you have many

Its seems to be working now, I was refering to the previous post (above) that was was attempting update the text in a label, this was done in the update method of the Appllication class.

self.lblpower.text = "any text value"

Instead I found I could achieve the goal by using the config method:

self.lblpower.config(text=caption_pwr)

---

You can also treat the option name like a dictionary index

self.lblpower['text']=caption_pwr

Ref
https://docs.python.org/3/library/tkinte...-reference
https://docs.python.org/3/library/tkinte...el-options
or widget variables
https://docs.python.org/3/library/tkinte...-variables

Thanks for the web links , the handy reference looks more like my cup of tea.