title: Python 3: ResourceWarning: unclosed file <_io.TextIOWrapper name='PATH_OF_FILE'
body: <p>When I run the test cases in python with <em>"python normalizer/setup.py test
  "</em>  I am getting the below exception</p>
  
  <pre><code> ResourceWarning: unclosed file &lt;_io.TextIOWrapper name='/Users/workspace/aiworkspace/skillset-normalization-engine/normalizer/lib/resources/skills.taxonomy' mode='r' encoding='utf-8'&gt;
  </code></pre>
  
  <p>In code I am reading a big file like below:</p>
  
  <pre><code>def read_data_from_file(input_file):
      current_dir = os.path.realpath(
          os.path.join(os.getcwd(), os.path.dirname(__file__)))
      file_full_path = current_dir+input_file
      data = open(file_full_path,encoding="utf-8")
      return data
  </code></pre>
  
  <p>What am I missing?</p>