title: Can't locate a python script from error message
body: <p>I am trying to trace the origin of a python error message that I am getting when I try to run my code <code>test.py</code>.</p>
  
  <p>The module (which is called by <code>test.py</code>) that I am trying to trace from the error output is apparently:</p>
  
  <pre><code>build/bdist.linux-x86_64/egg/george/gp.py
  </code></pre>
  
  <p>The error message snippet:</p>
  
  <pre><code>File "build/bdist.linux-x86_64/egg/george/gp.py", line 498, in
      predict
  </code></pre>
  
  <ol>
  <li>I can find <code>build/bdist.linux-x86_64/</code> but it is empty. Maybe it's not the 'right one'.</li>
  <li>I have also found a different version of <code>gp.py</code>, but when I make changes to that, nothing happens, so <code>test.py</code> is not calling that version.</li>
  </ol>
  
  <p>All I want to do is find the code in which the error is occurring so that I can add some more outputs to it to figure out what is going wrong.</p>
  
  <hr>
  
  <p>Here is the error message:</p>
  
  <pre><code>Traceback (most recent call last):
    File "test.py", line 213, in &lt;module&gt;
      mumc, dummy = gp1.predict(residuals, dates, kernel = kernelprime )
    File "build/bdist.linux-x86_64/egg/george/gp.py", line 511, in predict
    File "build/bdist.linux-x86_64/egg/george/solvers/basic.py", line 87, in apply_inverse
    File "/home/me/.local/lib/python2.7/site-packages/scipy/linalg/decomp_cholesky.py", line 174, in cho_solve
      b1 = asarray_chkfinite(b)
    File "/home/me/.local/lib/python2.7/site-packages/numpy/lib/function_base.py", line 1219, in asarray_chkfinite
  "array must not contain infs or NaNs")
  ValueError: array must not contain infs or NaNs
  </code></pre>
  
  <p>So obviously, at some point down the line, I am feeding an array that contains infs or NaNs into some scipy or numpy code that it doesn't like. But to see why the values are infs or NaNs in the first place, it seems like whatever is going wrong is happening in the <code>predict</code> module.</p>
  
  <p>(gp1 is a class which is also defined in the <code>gp.py</code> code!)</p>