title: Python MacOS Error: Unable to revert mtime: /Library/Fonts
body: <p>I am trying to run a python script on my mac but </p>
  
  <p><strong>"Unable to revert mtime: /Library/Fonts"</strong> </p>
  
  <p>keeps popping up when i run the program. i have the latest version of python installed as well as <strong>matplotlib</strong>. i am very new to python so i do not know what the issue is but here is the snippet of the code:</p>
  
  <pre><code>from plotly import graph_objs as go 
  import matplotlib.pyplot as plt
  import numpy as np
  import json
  import datetime
  
  with open('ELIX.json') as json_file:
  data = json.load(json_file)
  </code></pre>