Python tkinter inserting string in texttbox out of a function

Question

Trying to add text from a function into a textfield, but can't figure out how. Every time when the Start button is clicked it should add text to the textfield.

import Tkinter

class GuiCreate:

    def __init__(self,parent):

        #Textbox
        window  = Frame(width=620, height=50)
        window.place(x=25,y=320)
        vscroll = Scrollbar(window)
        hscroll = Scrollbar(window, orient='horizontal')
        #  create instance variable with "self"
        self.listbox = Text(window, height=10) 
        self.listbox.pack(side=LEFT, fill=X, padx=5, pady=5, expand=1)
        vscroll.config(command=self.listbox.yview, relief=SUNKEN)
        hscroll.config(command=self.listbox.xview, relief=SUNKEN)
        self.listbox.config(yscrollcommand=vscroll.set, relief=SUNKEN)
        self.listbox.config(xscrollcommand=hscroll.set)

        f7 = Frame(width=30, height=20)
        f7.place(x=20,y=260)
        srcButton = Button(f7, text="START", command=self.startProcess)
        srcButton.pack(side='left')


    def startProcess(self):
        textinsert = 'abcdefg'
        self.listbox.insert('end', textinsert)


root = Tk()
root.title("Clipfinder")
root.geometry('650x550+200+100')
root.configure(background = 'gray')
gui=GuiCreate(root)
root.mainloop()

Getting the Error: AttributeError: GuiCreate instance has no attribute 'listbox'

How can I send the string out of a function into the textbox? THX

Make sure self.listbox = Text(window, height=10) is called before you try and .pack it. — tijko
– tijko, Commented Mar 6, 2014 at 16:22
I'm confused, window is now not defined... self.listbox = Text(window, height=10) NameError: name 'window' is not defined. Sorry Objects is a little bit new to me — rainer
– rainer, Commented Mar 6, 2014 at 16:49
updated the post. Now getting NameError: name 'window' is not defined. — rainer
– rainer, Commented Mar 6, 2014 at 17:14
you had other references to listbox instead of the self.listbox in the scrollbar variables. — tijko
– tijko, Commented Mar 6, 2014 at 17:28
yes i added the self also at the vscroll.config(command=self.listbox.yview, relief=SUNKEN). It is exactly now as shown here. — rainer
– rainer, Commented Mar 6, 2014 at 17:34

drez90 · Accepted Answer · 2014-03-06 16:36:05Z

1

def __init__(self, parent):
    #Textbox
    window  = Frame(width=620, height=50)
    window.place(x=25,y=320)
    vscroll = Scrollbar(window)
    hscroll = Scrollbar(window, orient='horizontal')
    self.listbox = Text(window, height=10)
    self.listbox.pack(side=LEFT, fill=X, padx=5, pady=5, expand=1)
    vscroll.config(command=self.listbox.yview, relief=SUNKEN)
    hscroll.config(command=self.listbox.xview, relief=SUNKEN)
    self.listbox.config(yscrollcommand=vscroll.set, relief=SUNKEN)
    self.listbox.config(xscrollcommand=hscroll.set)

    f7 = Frame(width=30, height=20)
    f7.place(x=20,y=260)
    srcButton = Button(f7, text="START", command=self.startProcess)
    srcButton.pack(side='left')

Forgot to add listbox as an attribute. Otherwise it is just local to the init method..

answered Mar 6, 2014 at 16:36

drez90

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Comments

tijko · Accepted Answer · 2014-03-06 17:49:14Z

0

Try to create the listbox as an instance variable with self:

from Tkinter import *  

class GuiCreate:

    def __init__(self,parent):

        #Textbox
        window  = Frame(width=620, height=50)
        window.place(x=25,y=320)
        vscroll = Scrollbar(window)
        hscroll = Scrollbar(window, orient='horizontal')
        #  create instance variable with "self"
        self.listbox = Text(window, height=10) 
        self.listbox.pack(side=LEFT, fill=X, padx=5, pady=5, expand=1)
        vscroll.config(command=self.listbox.yview, relief=SUNKEN)
        hscroll.config(command=self.listbox.xview, relief=SUNKEN)
        self.listbox.config(yscrollcommand=vscroll.set, relief=SUNKEN)
        self.listbox.config(xscrollcommand=hscroll.set)

        f7 = Frame(width=30, height=20)
        f7.place(x=20,y=260)
        srcButton = Button(f7, text="START", command=self.startProcess)
        srcButton.pack(side='left')


    def startProcess(self):
        textinsert = 'abcdefg'
        self.listbox.insert('end', textinsert)


root = Tk()
root.title("Clipfinder")
root.geometry('650x550+200+100')
gui = GuiCreate(root)
root.configure(background = 'gray')
root.mainloop()

You can learn more about classes and object-orient programming in python here, a few paragraphs down it touches upon using self.

edited Mar 6, 2014 at 17:49

answered Mar 6, 2014 at 16:13

tijko

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6 Comments

rainer Over a year ago

then i get : self.listbox.pack(side=LEFT, fill=X, padx=5, pady=5, expand=1) NameError: name 'self' is not defined

rainer Over a year ago

seems like not... would: self.listbox = Text(parent) do this? sorry, don't know it...

tijko Over a year ago

@rainer the window variable is local to your init which means you won't be able to reference it in other class methods.

rainer Over a year ago

window itself is not referenced else, or is that connected because its the frame of the textbox?

tijko Over a year ago

@rainer Its tough to say without seeing more of the code.

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