jupyter notebook import error: no module named 'matplotlib'

Question

I\'m an ubuntu 16.4 user and I installed anaconda3 and using both python2 and python3 kernels.

>>>jupyter kernelspec list Available kernels: pyt

Answer 1

In my case, the matplotlib conda pkg was corrupted.

conda list

First, identify all the matplotlib pkgs installed in your environment. In my case, there were 2 pkgs.

matplotlib

matplotlib-base

Now remove those using conda.

conda remove matplotlib
conda remove matplotlib-base

Now check the list again to make sure, all the pkgs removed successfully. Then reinstall them again.

conda install matplotlib
conda install matplotlib-base

You may encounter an error saying

SafetyError: The package for matplotlib-base located at /home//anaconda3/pkgs/matplotlib-base-3.1.3-py37hef1b27d_0 appears to be corrupted. The path 'lib/python3.7/site-packages/matplotlib-3.1.3-py3.7-nspkg.pth' has an incorrect size. reported size: 569 bytes actual size: 570 bytes

Now you need to remove this corrupted folder, in my case, "matplotlib-base-3.1.3-py37hef1b27d_0".

Then try installing the pkgs again. It's better to run

conda remove matplotlab

again before reinstalling, to make sure anything left of those pkgs completely wiped out.