python3 i wonder if u guys can solve? : Guys i code on this website :https://repl.it/ | i really need help with python,in tkinter stuff                 this is my code:    

    from tkinter import *
    
    import tkinter as tk
    
    root = tk.Tk()
    
    root.geometry('400x400')
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     so guys the error is :   
    Traceback (most recent call last):
      File "main.py", line 4, in <module>
        root = tk.Tk()
      File "/usr/local/lib/python3.7/tkinter/__init__.py", line 202
    3, in __init__
        self.tk = _tkinter.create(screenName, baseName, className,
    interactive, wantobjects, useTk, sync, use)
    _tkinter.TclError: no display name and no $DISPLAY environment
    variable

     

 

     
   i wonder if u guys can pls help me...thx! :D                                                                                                                         