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/<yourusername>/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.

Answer 2

When using python3 version of jupyter (pip3 install jupyter), matplotlib has to be installed using pip3: pip3 install matplotlib

Answer 3

I have checked the version of python executable and the path from where the library is getting used:

import sys

sys.executable # to know the version of executable used

sys.path # to know from which path library is getting imported.

And then: I have installed the library in jupyter notebook cell by using pip.

pip install matplotlib

After that import started working for me.

Answer 4

This worked for me on my windows 10 :

1. I didn't use conda. I simply downloaded python 3.x version, then created a python 3 environment by the following command : c:\python3x\python -m venv c:\path\to\your\env.
2. After that you can check your python version by this command python -v.
3. Then you need to activate the python 3 environment by entering this command : env/Scripts/activate.
4. Then install the matplotlib library by doing pip3 install matplotlib .

Answer 5

For those still looking for a solution, especially using virtualenv, this worked for me:

1 - Inside your project directory, create a virtual environment. You may have to install virtualenv in case you don't have it

virtualenv myenv --python=python3.7

2 - Install matplotlib inside of your virtual env:

pip3 install matplotlib

3 - Install ipykernel inside your virtual env

pip3 install ipykernel

4 - Connect your jupyter kernel to your new environment. You may have to use sudo here

python3 -m ipykernel install --name=myenv

5 - When you start your jupyter lab, you will have the option to select your env, which has matplotlib installed

Answer 6

I'd recommend reading through here:

https://conda.io/docs/py2or3.html

I had the same problem after installing a Python 2.7 environment inside my Anaconda3 installation. I'm not sure which command I used to create the environment, but it actually didn't install all the optional packages that are usually bundled with Anaconda (like matplotlib, numpy, ...). But that's not a big issue, you can easily install additional packages with pip as follows:

First, list your conda environments:

C:\Users\Felix>conda info --envs
# conda environments:
#
ipykernel_py2            D:\Anaconda\envs\ipykernel_py2
root                  *  D:\Anaconda

Next, activate your python 2 environment using source activate <env> (Linux/OSX) or activate <env> (Windows):

C:\Users\Felix>activate ipykernel_py2

(ipykernel_py2) C:\Users\Felix>

Finally, use pip to install the required packages:

(ipykernel_py2) C:\Users\Felix>pip install matplotlib
Collecting matplotlib
...
Successfully installed matplotlib-2.0.0

Hope that this helps.