title: Python yaml generate few values in quotes
body: <p>I am using the <code>yaml</code> module in my Python script to generate a YAML file. The following is an example: </p>
  
  <pre><code>import yaml
  class MyDumper(yaml.Dumper):
  
      def increase_indent(self, flow=False, indentless=False):
          return super(MyDumper, self).increase_indent(flow, False)
  
  foo = {
      'instance_type': 'test',
      'hostname': "\"testhost\"",
      'name': 'foo',
      'my_list': [
          {'foo': 'test', 'bar': 'test2'},
          {'foo': 'test3', 'bar': 'test4'}],
      'hello': 'world',
  }
  
  print yaml.dump(foo, Dumper=MyDumper, default_flow_style=False)
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>hello: world
  hostname: '"testhost"'
  instance_type: test
  my_list:
    - bar: test2
      foo: test
    - bar: test4
      foo: test3
  name: foo
  </code></pre>
  
  <p>In above  output  hostname value has single and double quotes, I want  only double quotes.</p>
  
  <p>Expected output:</p>
  
  <pre><code>hello: world
  hostname: "testhost"
  instance_type: test
  my_list:
    - bar: test2
      foo: test
    - bar: test4
      foo: test3
  name: foo
  </code></pre>