I'm playing around a bit in Tkinter python when I get this error for what I think is no reason whatsoever.

    print(self.entries[x])
IndexError: list index out of range

My code:

from tkinter import *

class Application(Frame):
    def __init__(self, master):
        super().__init__(master)
        self.master = master
        self.submit()

    def submit(self):
        for x in range(2):
            self.entries = []
            self.buttons = []
            e = Entry()
            self.entries.append(e)
            self.entries[x].grid(row=x, column=0)
            b = Button(text='SUBMIT', command=lambda x=x: print(self.entries[x].get()))
            self.buttons.append(b)
            self.buttons[x].grid(row=x, column=1)

root = Tk()
app = Application(root)
app.mainloop()

The goal is to make multiple rows of entries and submit buttons with this single loop. I have tried to remove all the self in front of everything in the function, but to no avail.

Everything works if the range() in the for loop has a 1, but not for any other number. Can someone please explain? My 1 year course in high school didn't set me up for this kind of stuff.

CodePudding user response：

You keep resetting self.entries and self.buttons each time the for loop runs. You need to move the self.entries = [] and self.buttons = [] before the for loop like this:

from tkinter import *

class Application(Frame):
    def __init__(self, master):
        super().__init__(master)
        # self.master = master # Useless
        self.submit()

    def submit(self):
        self.entries = []
        self.buttons = []
        for x in range(2):
            e = Entry(self)
            e.grid(row=x, column=0)
            self.entries.append(e)
            b = Button(self, text="SUBMIT", command=lambda x=x: print(self.entries[x].get()))
            b.grid(row=x, column=1)
            self.buttons.append(b)

root = Tk()
app = Application(root)
app.pack()
app.mainloop()

Also another few things:

• Instead of self.entries[x].grid(...), you can use e.grid(...)
• You never passed in anything for the master argument when creating the entries and buttons.
• You inherited from tk.Frame but never put anything inside it and you didn't even call app.pack(...)/app.grid(...)
• Also please you import tkinter as tk instead of from tkinter import *.

CodePudding user response：

First I gave x in range(0) to solve out of index problem but buttons in output are not visible then I tried to move the self.entries = [] and self.buttons = [] before the for loop.

Code

def submit(self):
    self.entries = []
    self.buttons = []
    for x in range(2):