title: How to add Python libraries to Docker image
body: <p>Today I started working with Docker. So please bear with me. I'm not even sure if the title makes sense. I just installed Tensorflow using Docker and wanted to run a script. However, I got the following error saying that Matplotlib is not installed.</p>
  
  <pre><code>Traceback (most recent call last):
  File "tf_mlp_v3.py", line 3, in &lt;module&gt;
  import matplotlib.pyplot as plt
  ModuleNotFoundError: No module named 'matplotlib'
  </code></pre>
  
  <p>I used the following command to install Tensorflow</p>
  
  <pre><code>docker pull tensorflow/tensorflow:latest-gpu-jupyter
  </code></pre>
  
  <p>How can I now add other python libraries such as Matplotlib to that image?</p>