title: Cd to virtual environment instead of sourcing it
body: <p>I wonder if 'cd' directly to virtual environment is the same thing as sourcing the virtual environment. That is,</p>
  
  <ol>
  <li><code>source &lt;venv_name&gt;/bin/activate</code></li>
  <li><code>cd &lt;venv_name&gt;/bin/</code></li>
  </ol>
  
  <p>Is (1) the same as (2)? I.e., is everything visible (1) also visible in (2)?</p>