I'm trying make auto updating label from url.
I want to make something like pager. When file on server is changed, label should changes too. with button I can download it manually but I want to automate it. Where I'm making mistake?
from tkinter import *
import urllib.request
import time
root = Tk()
check = ""
#functions
def auto():
time.sleep(5) #becouse I don't want kill server
page = "http://howan.pl/pychal/plik.txt"
g = urllib.request.urlopen(page)
data = g.read()
g.close()
return (str(data, encoding='utf-8'))
def click():
page = "http://howan.pl/pychal/plik.txt"
g = urllib.request.urlopen(page)
data = g.read()
g.close()
label.config(text=str(data, encoding='utf-8'))
#Widgets
label = Label(root, text="zer0")
button = Button(root, text="hey", command= click)
if auto() == check:
check = auto
label.config(text=check)
print(auto())
label.pack()
button.pack()
root.mainloop()
To automate it you need to make a function that does the work, and then use root.after() to call that function on a regular basis. Since you have all the work in "click" already, you could just add:
def auto_click():
click()
root.after(5000, auto_click) # call this function again in 5,000 ms (5 seconds)
auto_click() # start the autoclick loop.
Related
I created a loop to create a button for each element in a list. How do I identify which button is clicked and then assign a command to each one, which will create a new page with the same name as the button clicked?.
yvalue = 200
for i in sdecks:
deckbutton1=Button(fcpage,text=i,width=21,bd=2,fg="ghost white",bg="orchid1")
deckbutton1.place(x=105, y=yvalue)
yvalue = yvalue + 20
Either I don't get you question or this (adapted from here) should answer your question:
from functools import partial
import tkinter as tk
def create_new_page(name_of_page):
print("Creating new page with name=\"%s\"" % name_of_page)
root = tk.Tk()
for i in range(5):
# Create the command using partial
command = partial(create_new_page, i)
button = tk.Button(root, text="Button number"+str(i+1), command=command)
button.pack()
root.mainloop()
I try to access/change button attributes for buttons created in a loop.
My idea was to collect the buttons in a list so that i can access every single button. Is there a better way?
At the moment i try to use the buttons-command to change the text of the clicked button. In the "action"-function i get the error-code "list index out of range" when i try to run the code!?
Since i am a newbie in python and tkinter hours over hours passed so far to find a solution without success.
Every idea would be very appreciated.
I used quite the same code without creating a list. The code was working but when i clicked a button only the last created button changed the text. Could it be that somehow i have to use the "StringVar"-function or "textvariable"?
import tkinter as tk
window = tk.Tk()
window.geometry("300x150")
window.title("Tic Tac Toe")
def action(i):
btns[i].configure(text = 'X')
btn_nr = -1
btns = []
for x in range(1,4):
for y in range(1,4):
btn_nr += 1
print(btn_nr)
btns.append(tk.Button(text='-', command = action(int(btn_nr))))
btns[int(btn_nr)].grid(row=x, column=y)
exit_button = tk.Button(text='Exit Game', command=window.destroy)
exit_button.grid(row=4, column=1, columnspan=15)
window.mainloop()
You were almost there. See below matter being resolved as you need a lambda to pass the btn_nr to the function action. By the way there is no need for int()
import tkinter as tk
window = tk.Tk()
window.geometry("300x150")
window.title("Tic Tac Toe")
def action(button):
if btns[button].cget('text') == '-':
btns[button].configure(text='X')
else:
btns[button].configure(text='-')
btn_nr = -1
btns = []
for x in range(1, 4):
for y in range(1, 4):
btn_nr += 1
print(btn_nr)
btns.append(tk.Button(text='-', command=lambda x=btn_nr: action(x)))
btns[btn_nr].grid(row=x, column=y)
exit_button = tk.Button(text='Exit Game', command=window.destroy)
exit_button.grid(row=4, column=1, columnspan=15)
window.mainloop()
I changed the action function a little to make it toggle between 'X' and '-'.
Environment: macOS Catalina, Python 3.7.4, Tcl/Tk 8.6.9, VSC 1.39.1
I have a situation where I am using a bar/qr code scanner to provide a string to a ttk.Entry() method, which then fires off a function.
The reader is seen by the OS as an HID keyboard, so the text from the QR code is received by the ttk.Entry() widget that I give focus to during code execution. I have bound the widget to the key because the scanner sends a cr/lf at the end of the text string, which works as needed.
However, I am running into an issue where if the qr code lingers over the scanner too long it will rescan the qr code and the widget receives the qr code text again, which then causes it to be processed again.
I have tried disabling the ttk.Entry() in the function, deleting the widget contents, and removing focus to no avail. The behavior I'm seeing is occurring even though the widget is disabled and does not have focus, it is still getting input and executing the function again if the scanner rescans the qr code while the function is executing.
In this first example, I simply tried to disable the widget, but that doesn't work. The widget still gets the later scans while in the function.
# test-ttk-entry1.py
import time
import tkinter as tk
from tkinter import StringVar, ttk
root = tk.Tk()
def print_text(event):
global kbEntry
textValue = kbEntry.get()
kbEntry.configure(state="disabled")
time.sleep(2) # Add in a delay to allow for repeat scan
print(textValue)
time.sleep(2) # Add in a delay to allow for repeat scan
kbEntry.configure(state="active")
kbText = StringVar()
kbEntry = ttk.Entry(root, width=10, textvariable=kbText)
kbEntry.bind("<Return>", print_text)
kbEntry.pack()
kbEntry.focus_set()
root.mainloop()
The second attempt was to disable the entry widget and upon making it active again delete the text in the field.
# test-ttk-entry2.py
import time
import tkinter as tk
from tkinter import END, StringVar, ttk
root = tk.Tk()
def print_text(event):
global kbEntry
textValue = kbEntry.get()
kbEntry.delete(0, END)
kbEntry.configure(state="disabled")
time.sleep(2) # Add in a delay to allow for repeat scan
print(textValue)
time.sleep(2) # Add in a delay to allow for repeat scan
kbEntry.configure(state="active")
kbEntry.delete(0, END)
kbText = StringVar()
kbEntry = ttk.Entry(root, width=10, textvariable=kbText)
kbEntry.bind("<Return>", print_text)
kbEntry.pack()
kbEntry.focus_set()
root.mainloop()
And finally, I was reading about taking focus from a widget and giving focus to the root window, so I added that in and it still prints multiple times to the console like there is a keyboard buffer being read by the ttk.Entry() widget. The weird thing is it seems like widgets don't normally respond to any calls to methods when they are disabled, but it appears the ttk.Entry() widget's properties/attributes (excuse me if my OOP terms are not correct) can be manipulated while disabled.
# test-ttk-entry2.py
import time
import tkinter as tk
from tkinter import END, StringVar, ttk
root = tk.Tk()
def print_text(event):
global kbEntry
textValue = kbEntry.get()
kbEntry.delete(0, END)
kbEntry.configure(state="disabled")
root.focus_set()
time.sleep(2) # Add in a delay to allow for repeat scan
print(textValue)
time.sleep(2) # Add in a delay to allow for repeat scan
kbEntry.configure(state="active")
kbEntry.delete(0, END)
kbEntry.focus_set()
kbText = StringVar()
kbEntry = ttk.Entry(root, width=10, textvariable=kbText)
kbEntry.bind("<Return>", print_text)
kbEntry.pack()
kbEntry.focus_set()
root.mainloop()
So how can I prevent the ttk.Entry() widget from accepting any input from the HID/keyboard device while my function is executing?
Since I am unable to find a way to temporarily disable the .Entry() widget programmatically to keep it from reading successive inputs, I have come up with this solution:
# test-ttk-entry2.py
import time
import tkinter as tk
from tkinter import END, StringVar, ttk
root = tk.Tk()
tempStr = "" # Global temporary string variable to trip repeated scans
def print_text(event):
global tempStr
textValue = kbEntry.get()
if tempStr == textValue:
kbEntry.delete(0, END)
print ("Duplicate scan")
return
tempStr = textValue
kbEntry.delete(0, END)
print(textValue)
time.sleep(3) # Simulate the time it takes for the function to complete
kbEntry = ttk.Entry(root, width=10)
kbEntry.bind("<Return>", print_text)
kbEntry.grid(row=0, column=0, padx=10, pady=10)
kbEntry.focus_set()
root.mainloop()
I'm trying to create a tk widget which auto-updates the score of a cricket match. this is my code. But it is not auto-updating.
please help me with this.
import requests
from bs4 import BeautifulSoup
from tkinter import *
from tkinter import ttk
import time, threading
def scrape_cric():
#this below link can be any link of an ongoing match.
page = 'http://www.cricbuzz.com/live-cricket-scores/18733/engu19-vs-bdeshu19-5th-place-playoff-semi-final-2-icc-under-19-world-cup-2018'
r = requests.get(page)
soup = BeautifulSoup(r.text, 'lxml')
score_1 = soup.find('div', {'class':'cb-min-bat-rw'})
score = soup.find('span', {'class':'cb-font-20 text-bold'})
return score.text
def display_Score():
root = Tk()
top_frame = Frame(root)
bottom_frame = Frame(root)
Label1 = Label(top_frame, text = scrape_cric())
Label1.pack()
top_frame.pack()
mainloop()
threading.Timer(10, display_Score()).start()
display_Score()
It displays the score once on executing and doesn't auto-update. Once i close the tk widget, it again appears with updated scores. I don't want to close it to. It should update without e closing it.
The cause of this problem is beacuse you create a new root Tk in each call to the function instead of changing the text alone
A fix around that would be:
root = Tk()
top_frame = Frame(root)
label = Label(top_frame)
top_frame.pack()
label.pack()
def update():
label['text']=scrape_cric()
threading.Timer(10, update).start() #####
update()
root.mainloop()
Another important note: make sure you set the target of the timer to the function object, instead of calling it inside the creation of your timer
I know that it's often best practice to write Tkinter GUI code using object-oriented programming (OOP), but I'm trying to keep things simple because I'm new to Python.
I have written the following code to create a simple GUI:
#!/usr/bin/python3
from tkinter import *
from tkinter import ttk
def ChangeLabelText():
MyLabel.config(text = 'You pressed the button!')
def main():
Root = Tk()
MyLabel = ttk.Label(Root, text = 'The button has not been pressed.')
MyLabel.pack()
MyButton = ttk.Button(Root, text = 'Press Me', command = ChangeLabelText)
MyButton.pack()
Root.mainloop()
if __name__ == "__main__": main()
The GUI looks like this.
I thought the text in the GUI (MyLabel) would change to "You pressed the button!" when the button is clicked, but I get the following error when I click the button:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\elsey\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1549, in __call__
return self.func(*args)
File "C:/Users/elsey/Documents/question code.py", line 6, in ChangeLabelText
MyLabel.config(text = 'You pressed the button!')
NameError: name 'MyLabel' is not defined
What am I doing wrong? Any guidance would be appreciated.
MyLabel is local to main() so the way you can not access it that way from ChangeLabelText().
If you do not want to change the design of your program, then you will need to change the definition of ChangeLabelText() like what follows:
def ChangeLabelText(m):
m.config(text = 'You pressed the button!')
And withing main() you will need to pass MyLabel as an argument to ChangeLabelText().
But again, you will have a problem if you code this command = ChangeLabelText(MyLabel) when you declare and define MyButton because the program will execute directly the body of ChangeLabelText() at the start and you will not have the desired result.
To resolve this later problem, you will have to use (and may be read about) lambda
Full program
So your program becomes:
#!/usr/bin/python3
from tkinter import *
from tkinter import ttk
def ChangeLabelText(m):
m.config(text = 'You pressed the button!')
def main():
Root = Tk()
MyLabel = ttk.Label(Root, text = 'The button has not been pressed.')
MyLabel.pack()
MyButton = ttk.Button(Root, text = 'Press Me', command = lambda: ChangeLabelText(MyLabel))
MyButton.pack()
Root.mainloop()
if __name__ == "__main__":
main()
Demo
Before clicking:
After clicking:
Are your sure you don't want to do it as a class (i think it makes the code a bit more clean as your project grows)? Here is a way to accomplish what you'e looking for:
#!/usr/bin/python3
from tkinter import *
from tkinter import ttk
class myWindow:
def __init__(self, master):
self.MyLabel = ttk.Label(root, text = 'The button has not been pressed.')
self.MyLabel.pack()
self.MyButton = ttk.Button(root, text = 'Press Me', command = self.ChangeLabelText)
self.MyButton.pack()
def ChangeLabelText(self, event=None):
self.MyLabel.config(text = 'You pressed the button!')
if __name__ == "__main__":
root = Tk()
mainWindow = myWindow(root)
root.mainloop()
In a Mac, is looks like this before pressing the button:
And when you press it:
But basically, in order to be able to change the text in a Label or a button, you need to ensure it has an active reference. In this case, we are doing it by creating the window as a class and referencing the widgets in the form self. widget_name = widget().
but I'm trying to keep things simple because I'm new to Python Hopefully this helps in understanding that classes are the simple way, otherwise you have to jump through hoops and manually keep track of many variables. Also, the Python Style Guide suggests that CamelCase is used for class names and lower_case_with_underlines for variables and functions. https://www.python.org/dev/peps/pep-0008/
from tkinter import *
from tkinter import ttk
class ChangeLabel():
def __init__(self):
root = Tk()
self.my_label = ttk.Label(root, text = 'The button has not been pressed.')
self.my_label.pack()
## not necessary to keep a reference to this button
## because it is not referenced anywhere else
ttk.Button(root, text = 'Press Me',
command = self.change_label_text).pack()
root.mainloop()
def change_label_text(self):
self.my_label.config(text = 'You pressed the button!')
if __name__ == "__main__":
CL=ChangeLabel()