title: contextlib not found in virtual environment
body: <p>I have a Python script which has been created to pull data out of a database and present it in an excel spreadsheet. Because multiple people need this script, I have placed the script on a network drive. To run the script, I have also created a virtual environment in a folder on my workstation, which I then copied to the network location. I have a batch file which runs the script using the virtual environment version of Python.</p>
  
  <p>When I run the batch file on my workstation (from the network drive), everything works fine. When another user, who does not have Python installed on their workstation, runs the batch file, they receive the following error:</p>
  
  <p><strong>ModuleNotFoundError: No module named 'contextlib'</strong></p>
  
  <p>The traceback for the error comes from:</p>
  
  <p><strong>virtualenv\lib\site.py</strong></p>
  
  <p><strong>virtualenv\lib\importlib\util.py</strong></p>
  
  <p>Is there something that I am missing when creating the virtual environment? To create it, I used the following commands (on Windows):</p>
  
  <pre><code>mkdir virtualenv
  virtualenv virtualenv
  \virtualenv\Scripts\activate
  pip install [packages required for script]]
  \virtualenv\Scripts\deactivate
  </code></pre>
  
  <p>Any help is very much appreciated.</p>