tkinter

[Larz60+]

some linux versions don't install tkinter by default (OpenSuse for one)
in this case, import using Yast or YUM or zypper or whatever the install package is named on your distro.
as a simple test:

• open a terminal window
  
• type 'python' you should see interactive prompt >>>
  
• if python 3: type import tkinter
  
• else if python 2.7 type import Tkinter
  
• If no errors, tkinter is installed
  
• exit interpreter by typing quit()