title: python compare operator in string
body: <p>when python compare operator in string.
  How does it work?</p>
  
  <p>"1.0.3" > "1.0.0"
  return true</p>
  
  <p>"1.0.3" > "1.0.6"
  return false</p>
  
  <p>I heard it is using ascii code.</p>
  
  <p>Anyone please detail explain this Issue.</p>
  
  <p>thank U.</p>