title: Including other Python file in current project
body: <p>I have the following file. It contains several functions that I would use frequently. Instead of writing the same function over and over in every project, I think it would be more efficient if we are able to include the files in each project.</p>
  <p>I want to include functions inside this file:</p>
  <p><a href="https://i.stack.imgur.com/fqhej.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fqhej.png" alt="enter image description here" /></a></p>
  <p>However, I don't know what technique is called and I am not sure if it is possible to make it work.</p>
  <p><code>tools</code> is not found:</p>
  <p><a href="https://i.stack.imgur.com/lpvco.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lpvco.png" alt="enter image description here" /></a></p>
  <p>Here's the folder that I want to include:</p>
  <p><a href="https://i.stack.imgur.com/AGHda.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AGHda.png" alt="enter image description here" /></a></p>
  <p>I have created <code>__init__.py</code> as explained in <a href="https://stackoverflow.com/a/4116384/17869806">https://stackoverflow.com/a/4116384/17869806</a></p>