title: Does pandas need to close connection?
body: <p>When using pandas "read_sql_query", do I need to close the connection? Or should I use a "with" statement? Or can I just use the following and be good?</p>
  
  <pre><code>from sqlalchemy import create_engine
  import pandas as pd
  
  sql = """
      SELECT * FROM Table_Name;
      """
  engine = create_engine('blah')
  
  df = pd.read_sql_query(sql, engine)
  
  print df.head()
  </code></pre>