title: Can't use cx_Oracle on MacOS even though it is already installed
body: <p>I opened a Terminal window under MacOS High Sierra and when I run the python command &quot;import cx_Oracle&quot; everything is fine.</p>
  <p>When I run a .py file on a PyCharm project, which the very first line of code is &quot;import cx_Oracle&quot; I get the following error message:</p>
  <p>&quot;ModuleNotFoundError: No module named 'cx_Oracle'&quot;.</p>
  <p>I have aliased my python3 command to python and when I run the command &quot;python -m pip install cx_Oracle&quot; I get a message telling me it's alright:</p>
  <p>&quot;Requirement already up-to-date: cx_Oracle in /usr/local/lib/python3.8/site-packages (8.0.0)&quot;</p>
  <p>I simply don't know what to do. Is that a matter of adding any path to any environment variable or a virtual environment under PyCharm related problem?</p>
  <p>Why does my Python Interpreter running through Terminal not alert me about any error, when I run the install command, everything is fine, but through my Python IDE I keep being alerted about a non existent module?</p>
  <p>Any help would be much appreciated.</p>
  <p>Thank you in advance!</p>