title: Python 3: get 2nd to last index of occurrence in string
body: <p>I have a string <code>abcdabababcebc</code> How do I get the index of the second-to-last occurrence of <code>b</code>? I searched and found rfind() but that doesn't work since it's the last index and not the second-to-last.</p>
  
  <p>I am using Python 3.</p>