CODEWITHSUNDEEP
pythonwidgettkintertk-toolkit
Dan Alexander
Dan Alexander

Reputation: 2072

Entry config error

I have a program that needs to change the state of the widget but the problem is I keep getting this error:

Traceback (most recent call last):
  File "C:\Users\Public\Documents\Programming\Spellox\Spellox.py", line 67, in <module>
      new_word()
  File "C:\Users\Public\Documents\Programming\Spellox\Spellox.py", line 37, in new_word
     entry['state'] = DISABLED
TypeError: 'NoneType' object does not support item assignment

Can anyone help here is my code for the entry widget:

from tkinter import *
import time

root = Tk()

entry = Entry(root, fg='blue', textvariable=check_var).pack(side=TOP)

def change():
     time.sleep(3)
     entry['state'] = DISABLED

change()

root.mainloop()

Thanks In Advance!

Upvotes: 1

Views: 411

Answers (2)

user2555451
user2555451

Reputation:

Your problem is that the pack method of Entry actually returns None, not the entrybox. You can see this by putting print(entry) right beneath the line where you define entry. It will print None in the terminal. To fix this problem, put pack on it's own line like this:

entry = Entry(root, fg='blue', textvariable=check_var)
entry.pack(side=TOP)

Now, entry refers to the entrybox like it should, not the pack method of the entrybox.

Also, if you plan to use change repeatedly in your script, then putting it in a named function is a good thing. Otherwise, I would simply do this:

from tkinter import *

root = Tk()

check_var = StringVar()
entry = Entry(root, fg='blue', textvariable=check_var)
entry.pack(side=TOP)

entry.after(3000, lambda:entry.config(state=DISABLED))

root.mainloop()

It's more concise and using a lambda means there is no need to define a whole named function just to be used one time.

Upvotes: 2

zhangyangyu
zhangyangyu

Reputation: 8610

pack returns nothing. So entry now is a None. Besides, using time.sleep in tk is not a good choice. You may use:

from tkinter import *

root = Tk()
check_var = StringVar()
entry = Entry(root, fg='blue', textvariable=check_var)

def change():
     entry['state'] = DISABLED

entry.after(3000, change)
entry.pack(side=TOP)
root.mainloop()

Upvotes: 2

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