title: Python: Convert string into date format
body: <p>I know this has been asked a few times, but my scenario is a little different... The objective I need to accomplish is to convert a string of digits '20150425' (which happens to be a date), into a date format such as, '2015-04-25'.  I need this because I am trying to compare date objects in my code, but have one variable type represented as a string.</p>
  
  <pre><code>Example below:
      date = '20150425' ## want to convert this string to date type format
      # conversion here
      conv_date = '2015-04-25' ## format i want it converted into
  </code></pre>
  
  <p>Hope this is clear.  Should not be difficult, just do not know how to do it.</p>