Error line 44, in update_table

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hi guys why this code return erro in line 44 for my opinion is correct o_O

import tkinter as tk
from tkinter import ttk
import socket
import threading

def cell_selected(event):
    selected_item = tree.selection()[0]
    item_values = tree.item(selected_item, 'values')
    print("Selected item:", item_values)

def connect_action():
    threading.Thread(target=receive_data).start()

def exit_program():
    root.quit()

def receive_data():
    host = "127.0.0.1"
    port = 23456
    
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.bind((host, port))
        s.listen()
        print(f"In ascolto su {host}:{port}")
        
        try:
            conn, addr = s.accept()	
            with conn:
                print(f"Connesso da {addr}")
                
                while True:
                    data = conn.recv(1024)
                    if not data:
                        break
                    data_str = data.decode("utf-8")
                    data_list = data_str.split(",")
                    
                    root.event_generate("<<DataReceived>>", data=data_list)
                    
        except socket.error as e:
            print("Errore nella connessione:", e)

def update_table(event):
    data_list = event.data
    if data_list:
        tree.item(tree.get_children()[1], values=data_list)

root = tk.Tk()
root.title("Spreadsheet App")

# Creazione del widget Notebook (schede)
notebook = ttk.Notebook(root)
notebook.pack(fill="both", expand=True)

# Primo tab con il primo Treeview
tab1 = ttk.Frame(notebook)
notebook.add(tab1, text="Terminal")

columns = ("Order","TimeOp","Type","Size","Symbol","Price","S/L","T/P",
           "Price","Com.","Swap","Profit","Comment","Close")

tree = ttk.Treeview(tab1, columns=columns, show="headings")
for col in columns:
    tree.heading(col, text=col)
    
tree.bind("<ButtonRelease-1>", cell_selected)
tree.pack(padx=10, pady=10)

# Pulsante "Connetti" a destra
connect_button = tk.Button(root, text="Connetti", command=connect_action)
connect_button.pack(side="right", padx=10, pady=5)

# Secondo tab con il secondo Treeview
tab2 = ttk.Frame(notebook)
notebook.add(tab2, text="Storico")

tree2 = ttk.Treeview(tab2, columns=("Symbol","Price","S/L"), show="headings")
# ... Aggiungi colonne e dati al secondo Treeview ...

tree2.bind("<ButtonRelease-1>", cell_selected)
tree2.pack(padx=10, pady=10)

exit_button = tk.Button(root, text="Esci", command=exit_program)
exit_button.pack(side="right", pady=5)

class CustomEvent:
    def __init__(self, widget, data):
        self.widget = widget
        self.data = data

def generate_custom_event(widget, data):
    event = CustomEvent(widget, data)
    widget.event_generate("<<DataReceived>>", when="tail", data=event)

root.bind("<<DataReceived>>", update_table)  # Bind custom event

root.mainloop()

the line 44 is

data_list = event.data

error dump:

In ascolto su 127.0.0.1:23456
Connesso da ('127.0.0.1', 64976)
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.11_3.11.1264.0_x64__qbz5n2kfra8p0\Lib\tkinter\__init__.py", line 1948, in __call__
    return self.func(*args)
           ^^^^^^^^^^^^^^^^
  File "C:\Users\pct\Desktop\python\tabella.py", line 44, in update_table
    data_list = event.data
                ^^^^^^^^^^

What I have tried:

nothing special for the moment

Posted 10-Aug-23 10:42am

GiulioRig

Updated 10-Aug-23 23:45pm

v4

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Comments

Dave Kreskowiak 10-Aug-23 18:34pm

You forgot to point what which line is "line 44" and the EXACT text of the error message.

GiulioRig 10-Aug-23 18:42pm

sorry is data_list = event.data

Dave Kreskowiak 10-Aug-23 19:29pm

Adn the exact error message? We only get what you type to work with, and a code dump with "it's broke" doesn't qualify as an answerable question.

Patrice T 11-Aug-23 2:07am

And you plan to tell us the error message ?

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Richard MacCutchan · Answer 1 · 2023-08-10T23:09:00

I suspect the problem is in the receive_data function. When it generates the <<DataReceived>> event it is possible that the event data is "None". You need to check that data_list contains some actual data before you pass it to the event handler.

[edit]
Running further tests it appears that custom events do not contain a data attribute. See tkinter — Python interface to Tcl/Tk — Python 3.11.4 documentation[^] for details.

But the tkinter documentation is somewhat sparse.

[/edit]

Andre Oosthuizen · Answer 2 · 2023-08-10T23:45:00

Your error is related to the way you're accessing the data of the custom event object. In your code you have created a custom event class called 'CustomEvent' to handle the custom data, but you are trying to access the data attribute of the event object directly, which is causing the error.

You need to modify the way you generate the custom event -

Python

def generate_custom_event(widget, data):
    event = CustomEvent(widget, data)
    widget.event_generate("<<DataReceived>>", when="tail", data=event)

You need to modify the 'receive_data' function to use the 'generate_custom_event' function to send the received data as a custom event -

Python

def receive_data():
    host = "127.0.0.1"
    port = 23456
    
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.bind((host, port))
        s.listen()
        print(f"In ascolto su {host}:{port}")
        
        try:
            conn, addr = s.accept()	
            with conn:
                print(f"Connesso da {addr}")
                
                while True:
                    data = conn.recv(1024)
                    if not data:
                        break
                    data_str = data.decode("utf-8")
                    data_list = data_str.split(",")
                    
                    #Send the received data as a custom event
                    generate_custom_event(root, data_list)
                    
        except socket.error as e:
            print("Errore nella connessione:", e)

In your 'update_table' function, you need to access the data attribute of the custom event object -

Python

def update_table(event):
    custom_event = event.data  #Access your custom event object
    data_list = custom_event.data
    if data_list:
        tree.item(tree.get_children()[1], values=data_list)

[EDIT]
If the error below in the comments is shown, it means you are trying handling threading in a 'Tkinter' application. 'Tkinter' is not thread-safe, meaning you can't update the GUI from a non-main thread directly. You need to ensure that the GUI updates are performed from the main thread. You need to use the 'root.after()' method to schedule updates in the main thread. You can learn more from - How to Schedule an Action with Tkinter after() method [^]

Python

#All your previous code...

#Function to handle received data inside the the main thread
def handle_received_data(data_list):
    if data_list:
        tree.item(tree.get_children()[1], values=data_list)

#I have modified receive_data function here...
def receive_data():
    host = "127.0.0.1"
    port = 23456
    
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.bind((host, port))
        s.listen()
        print(f"In ascolto su {host}:{port}")
        
        try:
            conn, addr = s.accept()	
            with conn:
                print(f"Connesso da {addr}")
                
                while True:
                    data = conn.recv(1024)
                    if not data:
                        break
                    data_str = data.decode("utf-8")
                    data_list = data_str.split(",")
                    
                    #Schedule GUI update in the main thread here...
                    root.after(0, handle_received_data, data_list)
                    
        except socket.error as e:
            print("Errore nella connessione:", e)

#The rest of your code...

OriginalGriff · Answer 3 · 2023-08-10T18:27:00

Since it's been over 5 hours, and you still haven't told us what the error message you are getting is, the best we can do is give you generic syntax error message help: How to Write Code to Solve a Problem, A Beginner's Guide Part 2: Syntax Errors[^]
And I'll throw this in there as well: Asking questions is a skill[^] - I'd suggest you have a good read of them both, they should help you in future.

Error line 44, in update_table

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