matplotlib error - no module named tkinter

you can use

import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt

if you dont want to use tkinter at all.

Also dont forget to use %matplotlib inline at the top of your notebook if using one.

EDIT: agg is a different backend like tkinter for matplotlib.

For Windows users, there's no need to download the installer again. Just do the following:

1. Go to start menu, type Apps & features,
2. Search for "python" in the search box,
3. Select the Python version (e.g. Python 3.8.3rc1(32-bit)) and click Modify,
4. On the Modify Setup page click Modify,
5. Tick td/tk and IDLE checkbox (which installs tkinter) and click next.

Wait for installation and you're done.

For Linux

Debian based distros:

sudo apt-get install python3-tk

RPM based distros:

sudo yum install python3-tkinter

For windows:

For Windows, I think the problem is you didn't install complete Python package. Since Tkinter should be shipped with Python out of box. See: http://www.tkdocs.com/tutorial/install.html . Good python distributions for Windows can be found by the companies Anaconda or ActiveState.

Test the python module

python -c "import tkinter"

p.s. I suggest installing ipython, which provides powerful shell and necessary packages as well.