title: Python --version does not update
body: <p>I upgraded and installed latest Python version 3.8.1. </p>
  
  <p>Problem is, when I type </p>
  
  <pre><code>python --version
  </code></pre>
  
  <p>on terminal I get Python 2.7.16, when I type </p>
  
  <pre><code>python3 --version
  </code></pre>
  
  <p>I get Python 3.8.1. But if I try to </p>
  
  <pre><code>pip install -U selenium
  </code></pre>
  
  <p>I get a message:</p>
  
  <blockquote>
    <p>"DEPRECATION: Python 2.7 reached the end of its life on January 1st,
    2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7.
    More details about Python 2 support in pip, can be found at
    <a href="https://pip.pypa.io/en/latest/development/release-process/#python-2-support" rel="noreferrer">https://pip.pypa.io/en/latest/development/release-process/#python-2-support</a>"</p>
  </blockquote>
  
  <p>I dont understand why is it running on Python 2.7</p>