title: How do I format a string using a dictionary in python-3.x?
body: <p>I am a big fan of using dictionaries to format strings. It helps me read the string format I am using as well as let me take advantage of existing dictionaries. For example:</p>
  
  <pre><code>class MyClass:
      def __init__(self):
          self.title = 'Title'
  
  a = MyClass()
  print 'The title is %(title)s' % a.__dict__
  
  path = '/path/to/a/file'
  print 'You put your file here: %(path)s' % locals()
  </code></pre>
  
  <p>However I cannot figure out the python 3.x syntax for doing the same (or if that is even possible). I would like to do the following</p>
  
  <pre><code># Fails, KeyError 'latitude'
  geopoint = {'latitude':41.123,'longitude':71.091}
  print '{latitude} {longitude}'.format(geopoint)
  
  # Succeeds
  print '{latitude} {longitude}'.format(latitude=41.123,longitude=71.091)
  </code></pre>