Why do i get this error in tkinter - Python

Question

This is my code:

from tkinter import *

root = Tk()

hw = Label(root, text="Hello World!")

hw.pack()

root.mainloop()

This is the error i get:

Traceback (most recent call last):
  File "/Users/lorisruegg/Documents/Python/tkinter.py", line 1, in <module>
    from tkinter import *
  File "/Users/lorisruegg/Documents/Python/tkinter.py", line 3, in <module>
    root = Tk()
NameError: name 'Tk' is not defined