ImportError: No module named ‘Tkinter’

You probably need to install it using one of (or something similar to) the following:

sudo apt-get install python3-tk 

You can also mention version number like this sudo apt-get install python3.7-tk for python 3.7.

sudo dnf install python3-tkinter

Why don’t you try this and let me know if it worked:

try:
    # for Python2
    from Tkinter import *   ## notice capitalized T in Tkinter 
except ImportError:
    # for Python3
    from tkinter import *   ## notice lowercase 't' in tkinter here

Here is the reference link and here are the docs

Better to check versions as suggested here:

if sys.version_info[0] == 3:
    # for Python3
    from tkinter import *   ## notice lowercase 't' in tkinter here
else:
    # for Python2
    from Tkinter import *   ## notice capitalized T in Tkinter

Or you will get an error ImportError: No module named tkinter

---

Just to make this answer more generic I borrowed the following from Devendra Bhat‘s comment:

On Fedora please use either of the following commands

sudo dnf install python3-tkinter-3.6.6-1.fc28.x86_64

or

sudo dnf install python3-tkinter