title: Get enumeration name by value
body: <p>Are there any standard methods to get <code>Enumeration names by value?</code></p>
  
  <p>An example:</p>
  
  <pre><code>class Example(enum.Enum):
      one = 1
      two = 2
  
  ex_variable = 1
  </code></pre>
  
  <p>Given <code>ex_variable</code>, can I obtain the string contained in Example.one.name?</p>