title: Python, how to sort dictionary by keys, when keys are floating point numbers in scientific format?
body: <p>I need to sort a Python dictionary by keys, when keys are floating point numbers in scientific format.  </p>
  
  <p>Example:</p>
  
  <pre><code>a={'1.12e+3':1,'1.10e+3':5,'1.19e+3':7,...}
  </code></pre>
  
  <p>I need to maintain key-value links unchanged.<br>
  What is the simplest way to do this?</p>