"tuple index out of range" on listbox select

Question

I'm trying to make a small text editor.

This is working fine but I'm having an error when the file in the list box gets unselected:

clicked = listbox.get(index[0])
IndexError: tuple index out of range

This happens when I click 2 or 3 times in an empty area.

How can I fix this?

import os
import tkinter as tk
from tkinter import END, INSERT
from tkinter.filedialog import askopenfilename, asksaveasfilename
from tkinter.ttk import Combobox
import easygui as easygui

window = tk.Tk()
window.title("Text Editor")

pathtofiles="notas/"

def open_file(event):
    listbox = event.widget
    index = listbox.curselection()
    clicked = listbox.get(index[0])
    if clicked:
        name_file.delete('1.0', END)
        name_file.insert(INSERT, clicked)
        txt_edit.delete('1.0', END)
        f = open(pathtofiles + clicked, "r")
        for x in f:
            txt_edit.insert(INSERT, x)


def create_txt():
    ficheiro = easygui.enterbox("Name your file?")
    if ficheiro:
        if ".txt" not in ficheiro:
            filename=ficheiro+".txt"
        txt_edit.delete('1.0', END)
        with open(pathtofiles + filename, "w+") as output_file:
            text = txt_edit.get(1.0, tk.END)
            output_file.write(text)
            name_file.delete('1.0', END)
            name_file.insert(INSERT, filename)
    return filename


def save_file():
    clicked = listbox.get(listbox.curselection())
    if clicked:
        clicked=listbox.get(listbox.curselection())
        with open(pathtofiles + str(clicked), "w") as output_file:
            text = txt_edit.get(1.0, tk.END)
            output_file.write(text)

txt_edit = tk.Text(window)
fr_buttons = tk.Frame(window, relief=tk.RAISED, bd=2, highlightbackground="black",  highlightthickness=0)

fr_buttons.grid(row=0, column=0, sticky="ns")
txt_edit.grid(row=0, column=1, sticky="nsew")

name_file = tk.Text(fr_buttons, height=1, width=15, relief="groove", borderwidth=2)
name_file.grid(row=0, column=0, pady=2)

listbox = tk.Listbox(fr_buttons)
listbox.grid(row=0, column=0,columnspan=2, pady=2, sticky="w")
listbox.bind('<<ListboxSelect>>', open_file)

btn_novo = tk.Button(fr_buttons, width="5",text="New", bg='red',fg='blue', command=create_txt)
btn_novo.grid(row=1, column=0, sticky="nw", padx=5)

btn_save = tk.Button(fr_buttons, width="5",text="Save", bg='red',fg='red', command=save_file)
btn_save.grid(row=1, column=1, sticky="nw", padx=5)

files = os.listdir(pathtofiles)
for line in files:
    listbox.insert('end', line)


def autosave():
    pass
    #save_file()
    #window.after(1000, autosave)

autosave()
window.mainloop()

print the index before the listbox.get(index[0])

(1,) (2,) (0,) (1,) (i have 3 files in that folder)

when i get the error it print (), how can i fix this? thanks

i manage with this

def open_file(event):
try:
    listbox = event.widget
    index = listbox.curselection()
    print(index)
    clicked = listbox.get(index[0])
    if len(listbox.get(index[0])) > 1:
        name_file.delete('1.0', END)
        name_file.insert(INSERT, clicked)
        txt_edit.delete('1.0', END)
        f = open(pathtofiles + clicked, "r")
        log_error=""
        for x in f:
            txt_edit.insert(INSERT, x)
except Exception as e:
    MsgBox = messagebox.showerror("ERRO!!!!", "Please select a file!!!!!!111111111")
    log_error = "check"

now i dont get error but i still lose "focus" of the file selected and lose all changes.

You should only ask one question per post. I've removed the second question as it was unrelated to the first one. You can create a separate post to ask it again. — mkrieger1, Jul 27 '21 at 13:52
What is the console output if you add `print(index)` before the line with `listbox.get(index[0])` that throws an error? — mkrieger1, Jul 27 '21 at 13:53
So the question is why `listbox.curselection()` returns an empty tuple, or if it is expected that it returns an empty tuple, you need to handle that case separately. — mkrieger1, Jul 27 '21 at 14:17
yes, thats the question, how can i handle when it returns an empty tuple? — newbPyth, Jul 27 '21 at 15:06
See https://stackoverflow.com/questions/53513/how-do-i-check-if-a-list-is-empty — mkrieger1, Jul 27 '21 at 15:27
"yes, thats the question, how can i handle when it returns an empty tuple?" Well, do you know what should happen if it returns an empty tuple? (Hint: *why* does it return an empty tuple?) Do you know how to check if it returns an empty tuple, and conditionally do something different? (Hint: what is `if` used for?) What is the actual difficulty? — Karl Knechtel, Jul 27 '21 at 15:41
it happens because the listbox loses "focus" on the selected file when i start typing int the text — newbPyth, Jul 27 '21 at 15:57

score 0 · Answer 1 · answered Jul 28 '21 at 08:58

fixed with a diferent call from listbox

 def onselect(event, listbox):
        w = event.widget
        try:
            idx = int(w.curselection()[0])
        except IndexError:
            return
        global clicked
        clicked=(w.get(idx))
        open_file(clicked)
        return clicked

listbox.bind('<<ListboxSelect>>', lambda e: onselect(e, listbox))

thank you all :)

score -1 · Answer 2 · answered Jul 27 '21 at 16:21

-1

I tried to fix your problem by adding a message in the text box,

try:
    clicked = listbox.get(index[0])
except:
    txt_edit.insert(INSERT, 'File not found Please try again...\n')
    clicked = False

added clicked = False so that it won't run the if statements below

answered Jul 27 '21 at 16:21

Vignesh

1,553
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10
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thanks, the problem was not the error, the problem is it skipping the filename when i select text in other text box – newbPyth Jul 27 '21 at 17:02
can you point me where you are clicking? because whereever i click i am not getting any error – Vignesh Jul 28 '21 at 06:40

"tuple index out of range" on listbox select

2 Answers2