title: ModuleNotFoundError: No module named 'sympy'
body: <p>I'm on MacOSX Mojave 10.14.6 on a MacBook Pro 2015. So I pip installed sympy, right?</p>
  
  <p>I head over to my shell, run python3, and do:</p>
  
  <pre><code>$python3
  Python 3.7.4 (v3.7.4:e09359112e, Jul  8 2019, 14:36:03) 
  [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import sympy
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ModuleNotFoundError: No module named 'sympy'
  </code></pre>
  
  <p>Just to be sure, I pip installed again just to make sure.</p>
  
  <pre><code>$ pip install sympy
  Requirement already satisfied: sympy in /usr/local/lib/python3.7/site-packages (1.4)
  Requirement already satisfied: mpmath&gt;=0.19 in /usr/local/lib/python3.7/site-packages (from sympy) (1.1.0)
  </code></pre>
  
  <p>My pip list also includes sympy as sympy 1.4.</p>
  
  <p>What's wrong here? Is there another setup step I've missed?</p>