Develop Reference

Tkinter not updating when changing variables

I'm tinkering with Tkinter and trying to check if my program is open on pressing a button, but the Tkinter is not updating my label. Why?
from win32gui import GetWindowRect, FindWindow
from tkinter import Tk, ttk, BooleanVar
class Bot:
root = Tk()
is_gta_open = BooleanVar(None, False)
def mta_open_string(self):
return "włączone" if self.is_gta_open.get() else "wyłączone"
def draw_gui(self):
frame = ttk.Frame(self.root, padding=10)
frame.grid()
ttk.Label(frame, text=f"Status gry: {self.mta_open_string()}").grid(column=0, row=0)
ttk.Button(frame, text="Odśwież", command=lambda: [self.try_finding_rect(), self.root.update()]).grid(column=1, row=0)
self.root.mainloop()
def try_finding_rect(self):
window_handle = FindWindow("Grand theft auto San Andreas", None)
if window_handle == 0:
self.is_gta_open.set(False)
return
self.is_gta_open.set(True)
def run(self):
self.try_finding_rect()
self.draw_gui()
if __name__ == "__main__":
Bot().run()
I'm updating the state using self.root.update method and using BooleanVar, so I don't know why this is not working.

I've put together a very minimal example app that should work as intended. I don't have a copy of GTA to test with so I used a different app, but it should function the same way with any app in principle:
import tkinter as tk
import ctypes
from tkinter import ttk
class Bot(tk.Tk): # init Tk
def __init__(self):
super.__init___()
APP_NAME = 'Grand theft auto San Andreas'
self.status_label = tk.Label(self, text='Press the button')
self.status_label.pack()
self.run_btn = ttk.Button(
self,
text='Click Me!',
command=lambda: self.check_for_app(APP_NAME)
)
self.run_btn.pack()
def check_for_app(app_name: str):
user32 = ctypes.WinDLL('user32')
if user32.FindWindowW(None, app_name):
self.status_label.config(text='Running')
else:
self.status_label.config(text='Not Running')
if __name__ == '__main__':
app = Bot()
app.mainloop()

Updating a variable won't change an f-string that uses the variable. You must explicitly configure the widget to show the new value.
To do that you'll need to keep a reference to the label widget, and then update the widget with the configure method.
def draw_gui(self):
...
self.status_label = ttk.Label(frame, text=f"Status gry: {self.mta_open_string()}")
self.status_label.grid(column=0, row=0)
...
def try_finding_rect(self):
...
self.is_gta_open.set(True)
self.status_label.configure(text=f"Status gry: {self.mta_open_string()}")
Personally I recommend using a proper method for the button rather than a complicated lambda. That will make the code easier to read and easier to debug.
For example:
def draw_gui(self):
...
ttk.Button(frame, text="Odśwież", command=self.update_status)
...
def update_status(self):
self.try_finding_rect(),
self.status_label.configure(text=f"Status gry: {self.mta_open_string()}")

Tkinter Get Text entry in Notebook page

I have created a notebook and added a frame to it:
nb = ttk.Notebook(root, style="TNotebook")
page1 = ttk.Frame(nb, style='Frame1.TFrame')
layout1(page1)
nb.add(page1, text='Welcome')
So i have a function layout1, the first page of the notebook,
i added to it a Text:
def layout1(page):
entry = Text(page, width=20)
entry.place(relx=0.03, rely=0.1, height=400)
Button(page, text='EXECUTE', command=import_entry).place(relx=0.5, rely=0.6)
And next i have my import_entry function:
def import_entry():
result = entry.get()
print(result)
I can't get the entry because of accessibilty of variables in function. So, how can i get it?

Here is an example of how you should structure your app with a class:
import tkinter
import tkinter.ttk as ttk
class App(tkinter.Tk):
def __init__(self):
super().__init__()
# assign on_closing method to window close event
self.protocol("WM_DELETE_WINDOW", self.on_closing)
self.title("Example App")
self.geometry("600x500")
self.button_1 = tkinter.Button(master=self, text="Test", command=self.button_event)
self.button_1.pack(pady=10)
# create more widgets ...
def button_event(self, event):
print("button pressed")
def on_closing(self):
# code that needs to happen when gets closed
self.destroy() # controlled closing of window with .destroy()
if __name__ == "__main__":
app = App()
app.mainloop()

simple window with an enter field

i'm a new programmer and there are certainly several errors but this shouldn't be difficult to spot. I need to create a simple window with a field named "Concorrente 1:" and an entry field displayed by function named lacopertina(). I don't understand where is the error:
import tkinter as tk
from tkinter import *
from tkinter.ttk import *
from tkinter import ttk
class schermoiniziale(tk.Frame):
def lacopertina():
print(gio1)
#return (tot1)
def __init__(self):
global gio1
#tot1=0
#schermo1=Tk()
self.gio1=tk.StringVar()
lab1=ttk.Label(self, text="Concorrente 1:")
lab1.pack()
ent1=ttk.Entry(self, textvariable=self.gio1)
ent1.pack()
pulsante = ttk.Button(self, text="Inizio", textvariable=self.gio1, command=self.lacopertina)
pulsante.pack()
def main():
schermoiniziale().mainloop()
if __name__== "__main__":
main()

I would suggest you to go through some tutorials on Python OOP.
I have modified your code as below with some comment:
# avoid using wildcard import
import tkinter as tk
from tkinter import ttk
class schermoiniziale(tk.Frame):
def __init__(self, master, **kw):
# need to call __init__() of inherited class
super().__init__(master, **kw)
self.gio1 = tk.StringVar()
lab1 = ttk.Label(self, text="Concorrente 1:")
lab1.pack()
ent1 = ttk.Entry(self, textvariable=self.gio1)
ent1.pack()
# removed textvariable=self.gio1 as I think you actually don't need it
pulsante = ttk.Button(self, text="Inizio", command=self.lacopertina)
pulsante.pack()
def lacopertina(self):
# use .get() to get the content of a StringVar
print(self.gio1.get())
def main():
# need to create the root window before creating other widget
root = tk.Tk()
# pass root window as the parent of the widget
frame = schermoiniziale(root)
frame.pack()
# start the tkinter mainloop
root.mainloop()
if __name__== "__main__":
main()

How to add a hyperlink to a tkinter button

I currently working on some code on Tkinter and I want to know if its possibly and if so how to add a website hyperlink to a button. In my case I'm trying to add the Caldicot School web address to a button through Tkinter on Python 3 and when its clicked it sends you there

Welcome to SO!
This page has a recipe for creating a button that acts like a hyperlink in tkinter
http://code.activestate.com/recipes/580774-tkinter-link-or-hyperlink-button/
The main part of the code is as follows:
if __name__ == "__main__":
import webbrowser
try:
from Tkinter import Tk, Frame
except ImportError:
from tkinter import Tk, Frame
def callback():
webbrowser.open_new(r"http://www.google.com")
root = Tk()
frame = Frame(root, bg="white")
frame.pack(expand=True, fill="both")
# Creates a button that, when clicked, calls the function that sends you to your hyperlink.
link = Link_Button(frame, text="Google Hyperlink", action=callback)
link.pack(padx=10, pady=10)
root.mainloop()
Check the website above for the code behind the class Link_Button. In case the link dies, here's the rest of the code:
# Author: Miguel Martinez Lopez
try:
from Tkinter import Label
from ttk import Style
from tkFont import Font, nametofont
except ImportError:
from tkinter import Label
from tkinter.ttk import Style
from tkinter.font import Font, nametofont
def get_background_of_widget(widget):
try:
# We assume first tk widget
background = widget.cget("background")
except:
# Otherwise this is a ttk widget
style = widget.cget("style")
if style == "":
# if there is not style configuration option, default style is the same than widget class
style = widget.winfo_class()
background = Style().lookup(style, 'background')
return background
class Link_Button(Label, object):
def __init__(self, master, text, background=None, font=None, familiy=None, size=None, underline=True, visited_fg = "#551A8B", normal_fg = "#0000EE", visited=False, action=None):
self._visited_fg = visited_fg
self._normal_fg = normal_fg
if visited:
fg = self._visited_fg
else:
fg = self._normal_fg
if font is None:
default_font = nametofont("TkDefaultFont")
family = default_font.cget("family")
if size is None:
size = default_font.cget("size")
font = Font(family=family, size=size, underline=underline)
Label.__init__(self, master, text=text, fg=fg, cursor="hand2", font=font)
if background is None:
background = get_background_of_widget(master)
self.configure(background=background)
self._visited = visited
self._action = action
self.bind("<Button-1>", self._on_click)
#property
def visited(self):
return self._visited
#visited.setter
def visited(self, is_visited):
if is_visited:
self.configure(fg=self._visited_fg)
self._visited = True
else:
self.configure(fg=self._normal_fg)
self._visited = False
def _on_click(self, event):
if not self._visited:
self.configure(fg=self._visited_fg)
self._visited = True
if self._action:
self._action()

You can basicly add this method:
from tkinter import *
from tkinter import ttk
import webbrowser
root = Tk()
root.title = 'Link Button'
def link():
webbrowser.open_new(r"https://www.python.org")
and then link method to the button:
nut = ttk.Button(root, text='Link Button', command=link)
nut.pack()
root.mainloop()

import tkinter
import webbrowser
root = Tk()
root.title = 'link to the button'
def link():
webbrowser.open_new(r"https://www.python.org")
nut = ttk.Button(root, text='link to the button')
nut.pack()
root.mainloop()
and then just simply use
nut = ttk.Button(root, text= 'link to the button', command=link)
nut.pack()
root.mainloop()

why do I get a blank tkinter window?

so when i run this code and click the button:
from Tkinter import *
import thread
class App:
def __init__(self, master):
print master
def creatnew():
admin=Tk()
lab=Label(admin,text='Workes')
lab.pack()
admin.minsize(width=250, height=250)
admin.maxsize(width=250, height=250)
admin.configure(bg='light green')
admin.mainloop()
def other():
la=Label(master,text='other')
la.pack()
bu=Button(master,text='clicks',command=lambda: thread.start_new_thread(creatnew,()))
bu.pack()
other()
Admin = Tk()
Admin.minsize(width=650, height=500)
Admin.maxsize(width=650, height=500)
app = App(Admin)
Admin.mainloop()
i get a second tkinter window but its a white blank screen that makes both programs not respond.
any ideas

Don't use threads. It's confusing the Tkinter mainloop. For a second window create a Toplevel window.
Your code with minimal modifications:
from Tkinter import *
# import thread # not needed
class App:
def __init__(self, master):
print master
def creatnew(): # recommend making this an instance method
admin=Toplevel() # changed Tk to Toplevel
lab=Label(admin,text='Workes')
lab.pack()
admin.minsize(width=250, height=250)
admin.maxsize(width=250, height=250)
admin.configure(bg='light green')
# admin.mainloop() # only call mainloop once for the entire app!
def other(): # you don't need define this as a function
la=Label(master,text='other')
la.pack()
bu=Button(master,text='clicks',command=creatnew) # removed lambda+thread
bu.pack()
other() # won't need this if code is not placed in function
Admin = Tk()
Admin.minsize(width=650, height=500)
Admin.maxsize(width=650, height=500)
app = App(Admin)
Admin.mainloop()