[Python] how to install PIL with pip?

when I run the following

from tkinter import *
from PIL import ImageTk, Image




root.mainloop()


I got

Traceback (most recent call last):
File "image_viewer.py", line 2, in <module>
from PIL import ImageTk, Image
ImportError: No module named PIL


but I already install Pillow and everything is fine.

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