title: "Module not found error" when trying to run pytube on PyCharm
body: <p>I am trying to use pytube to download videos but it isn't working. I don't know much about python (or any other programming language) so it is likely that my problem is easy to solve. I have tried reading multiple websites and watching several YouTube videos, but I haven't been able to make it work yet.</p>
  <ul>
  <li>I use a MacOS High Sierra 10.13.6;</li>
  <li>I have both Python 2.7.16 and Python 3.8.3 versions installed;</li>
  <li>I used the terminal to install pytube using &quot;pip install pytube3&quot;;</li>
  <li>When I try to install again using the same command as above, I think that it is correctly installed, because the terminal shows the following messages:</li>
  </ul>
  <pre><code>Requirement already satisfied: pytube3 in /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages (9.6.4)
  Requirement already satisfied: typing-extensions in /Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages (from pytube3) (3.7.4.3)
  </code></pre>
  <ul>
  <li>I am trying to use PyCharm 2020.2.1 (Community Edition)</li>
  <li>I think that pytube is also OK in PyCharm, because it appears in &quot;External libraries&quot; under &quot;site-packages&quot;</li>
  </ul>
  <p><strong>My problem:</strong>
  When I open PyCharm, it opens on &quot;main.py&quot;. There, I try to write:</p>
  <p><code>import pytube.</code></p>
  <p>But I get the following message:</p>
  <pre><code>/Users/applemacosx/PycharmProjects/pythonProject5/venv/bin/python /Users/applemacosx/PycharmProjects/pythonProject5/main.py
  Traceback (most recent call last):
    File &quot;/Users/applemacosx/PycharmProjects/pythonProject5/main.py&quot;, line 1, in &lt;module&gt;
      import pytube
  ModuleNotFoundError: No module named 'pytube'
  
  Process finished with exit code 1
  </code></pre>
  <p>I have tried searching about this error, but I wasn't able to find anything that I could make work. I would be very grateful if someone could help me understand what I am doing wrong.</p>