Why python compiler gives me an error in tkinder module?

Question

This is an example code:

from tkinter import * 

root = Tk() 
my_label = Label(root, text="Hello World")
my_laber.pack()
root.mainloop()

that doesn't work on my terminal: Ubuntu (18.04):

 Traceback (most recent call last):
      File "hello_world.py", line 3, in <module>
        root = Tk() #Setting the windown, to do first.
      File "/usr/lib/python3.6/tkinter/__init__.py", line 2023, in __init__
        self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
    _tkinter.TclError: no display name and no $DISPLAY environment variable

How can I fix it?

Python version

Python 3.6.9 (default, Nov  7 2019, 10:44:02)
[GCC 8.3.0] on linux

Does this answer your question? [\_tkinter.TclError: no display name and no $DISPLAY environment variable](https://stackoverflow.com/questions/37604289/tkinter-tclerror-no-display-name-and-no-display-environment-variable); https://stackoverflow.com/questions/56273204/tkinter-tclerror-no-display-name-and-no-display-environment-variable-python; https://stackoverflow.com/questions/48254530/tkinter-in-ubuntu-inside-windows-10-error-no-display-name-and-no-display-env — Tomerikoo, Mar 05 '20 at 11:59

score 0 · Answer 1 · answered Mar 05 '20 at 13:17

You can solve the issue by checking if there's a value assigned to environment variable DISPLAY and assigning it if returned string is empty:

from tkinter import *
import os

if os.environ.get('DISPLAY', '') == '':
    print('no display found. Using :0')
    os.environ['DISPLAY'] = ':0'

root = Tk()
my_label = Label(root, text="Hello World")
my_label.pack() # watch out here - you have a typo in your code
root.mainloop()

You can find more information about the numbers being assigned to DISPLAY in this ask ubuntu answer.

Why python compiler gives me an error in tkinder module?

1 Answers1