Why does my python installation not include tkinter?

tkinter is Python's standard GUI library. Sometimes it's not included in minimal installations or is separated as a different package.

Example:

ModuleNotFoundError: No module named 'tkinter'

Solution:

1. On Linux, try installing with 'sudo apt-get install python3-tk'.
2. On Windows/Mac, ensure you're using a full installation package, not a minimal one.