title: I cant use a python package even after installing it
body: <p>I want to install bullet,</p>
  <pre><code>pip3 install bullet
  </code></pre>
  <p>then run this script</p>
  <pre><code>from bullet import Bullet, Check, YesNo, Input
  </code></pre>
  <p>but I get this</p>
  <pre><code>ModuleNotFoundError: No module named 'bullet'
  </code></pre>
  <p>Whats happening?</p>
  <p>EDIT:
  I'm using python version 2.7.18</p>
  <p>I'm running my script through a file like this:</p>
  <pre><code>python3 file.py
  </code></pre>
  <p>which python = <code>/usr/bin/python</code></p>
  <p>which pip3 = <code>/Library/Frameworks/Python.framework/Versions/3.9/bin/pip3</code></p>