title: Install python package in docker file
body: <p>In my docker file, I want to install med2image python package (<a href="https://github.com/FNNDSC/med2image" rel="noreferrer">https://github.com/FNNDSC/med2image</a>). I use the following code:</p>
  
  <pre><code>FROM ubuntu:16.04
  RUN apt-get update &amp;&amp; apt-get install -y --no-install-recommends \
      python3.5 \
      python3-pip \
      &amp;&amp; \
  apt-get clean &amp;&amp; \
  rm -rf /var/lib/apt/lists/*
  RUN pip install nibabel pydicom matplotlib pillow
  RUN pip install med2image
  </code></pre>
  
  <p>But I get the following error when I want to build the image:</p>
  
  <pre><code>Downloading https://files.pythonhosted.org/packages/6f/e5/948b023c7feb72adf7dfb26d90a13c838737bbf52be704f5ddd0878e3264/med2image-1.1.2.tar.gz
  Complete output from command python setup.py egg_info:
  Sorry, only Python 3.5+ is supported.
  
  ----------------------------------------
  Command "python setup.py egg_info" failed with error code 1 in  /tmp/pip-install-FnNb_S/med2image/
  The command '/bin/sh -c pip install med2image' returned a non-zero code: 1
  </code></pre>
  
  <p>What should I do?!</p>